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quester [9]
4 years ago
13

3x+7=5x-21 Find the value of x

Mathematics
2 answers:
gregori [183]4 years ago
8 0
So try to get the x term to one side by itself
add 21 to both siede
3x+28=5x
subtract 3 x from both sides
28=2x
divide 2
14=x
nikitadnepr [17]4 years ago
3 0
Since <span>5x</span><span> contains the </span>variable<span> to solve for move it to the left-hand side of the </span>equation<span> by subtracting </span><span>5x</span><span> from both sides.
</span><span>3x+7−5x=−21

</span>Add <span>3x</span><span> and </span><span>−5x</span><span> to get </span><span><span>−2x</span>.
</span><span>−2x+7=−21

</span>Since 7<span> does not have the </span>variable<span> to solve for, move it to the right hand side of the </span>equation<span> by subtracting </span>7<span> from both sides.
</span><span>−2x=−7−21

</span>Subtract 21<span> from </span><span>−7</span><span> to get </span><span><span>−28</span>.
</span><span>−2x=−28

</span>Divide<span> each </span>term<span> in the </span>equation<span> by </span><span><span>−2</span>.
</span><span>x=14
</span>

Answer:
<span>x=14</span>
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