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78+78=8x+12
We move all terms to the left:
78+78-(8x+12)=0
We add all the numbers together, and all the variables
-(8x+12)+156=0
We get rid of parentheses
-8x-12+156=0
We add all the numbers together, and all the variables
-8x+144=0
We move all terms containing x to the left, all other terms to the right
-8x=-144
x=-144/-8
x=+18
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