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olga2289 [7]
3 years ago
7

3(7/3r+4/3)-2r+8=5r+12

Mathematics
1 answer:
ladessa [460]3 years ago
3 0

Answer:

r E <u>R</u>

<u>E</u><u>xplanation</u><u> </u><u>:</u><u> </u><u>3</u><u>(</u><u>7</u><u>/</u><u>3r</u><u>+</u><u>4</u><u>/</u><u>3</u><u>)</u><u>-2r</u><u>+</u><u>8</u><u>=</u><u>5r</u><u>+</u><u>12</u><u> </u><u>multiply</u><u> </u><u>parentheses</u><u> </u><u>by</u><u> </u><u>3</u><u> </u>

<u>D</u><u>o</u><u> </u><u>bracket</u><u> </u><u>first</u>

<u>(</u><u>7r</u><u>+</u><u>4</u><u>)</u><u> </u><u>answer</u><u> </u><u>from</u><u> </u><u>working</u><u> </u><u>out</u><u> </u><u>t</u><u>h</u><u>e</u><u> </u><u>bracket</u><u> </u><u>from</u><u> </u><u>above</u><u> </u><u> </u><u>7r</u><u>+</u><u>4-2r</u><u>+</u><u>8</u><u>=</u><u>5r</u><u>+</u><u>12</u>

<u>collect</u><u> </u><u>like</u><u> </u><u>terms</u><u> </u>

<u>5r</u><u>+</u><u>4</u><u>+</u><u>8</u><u>=</u><u>5r</u><u>+</u><u>12</u>

<u>Add</u><u> </u><u>the</u><u> </u><u>numbers</u>

<u>5r</u><u>+</u><u>12</u><u>=</u><u>5r</u><u>+</u><u>12</u>

<u>the</u><u> </u><u>statement</u><u> </u><u>is</u><u> </u><u>true</u><u> </u><u>for</u><u> </u><u>any</u><u> </u><u>value</u><u> </u><u>of</u><u> </u><u>r</u><u>,</u><u> </u><u>because</u><u> </u><u> </u><u>both</u><u> </u><u>sides</u><u> </u><u>are</u><u> </u><u>identical</u><u> </u>

<u>Solution</u><u> </u>

r <em>E</em><em> </em><em>R</em><em> </em>

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