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-68=5x+7x+4
We move all terms to the left:
-68-(5x+7x+4)=0
We add all the numbers together, and all the variables
-(12x+4)-68=0
We get rid of parentheses
-12x-4-68=0
We add all the numbers together, and all the variables
-12x-72=0
We move all terms containing x to the left, all other terms to the right
-12x=72
x=72/-12
x=-6
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