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-78-9x=-2x+11
We move all terms to the left:
-78-9x-(-2x+11)=0
We get rid of parentheses
-9x+2x-11-78=0
We add all the numbers together, and all the variables
-7x-89=0
We move all terms containing x to the left, all other terms to the right
-7x=89
x=89/-7
x=-12+5/7
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