The opposite of any positive number is the negative version and the opposite of any negative number is the positive version so the opposite of 7 is -7
First lets solve for x we know 3x=90. In this case x=30. Now we can solve for y. We know the triangle needs to equal 180 so y+2(30)=180. So we get y=120. Hope it helps
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10
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-80, -160, -320
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True
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