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-78=6x+4x+2
We move all terms to the left:
-78-(6x+4x+2)=0
We add all the numbers together, and all the variables
-(10x+2)-78=0
We get rid of parentheses
-10x-2-78=0
We add all the numbers together, and all the variables
-10x-80=0
We move all terms containing x to the left, all other terms to the right
-10x=80
x=80/-10
x=-8
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