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-2x-72=78+8x
We move all terms to the left:
-2x-72-(78+8x)=0
We add all the numbers together, and all the variables
-2x-(8x+78)-72=0
We get rid of parentheses
-2x-8x-78-72=0
We add all the numbers together, and all the variables
-10x-150=0
We move all terms containing x to the left, all other terms to the right
-10x=150
x=150/-10
x=-15
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