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12=12x-4-10x
We move all terms to the left:
12-(12x-4-10x)=0
We add all the numbers together, and all the variables
-(2x-4)+12=0
We get rid of parentheses
-2x+4+12=0
We add all the numbers together, and all the variables
-2x+16=0
We move all terms containing x to the left, all other terms to the right
-2x=-16
x=-16/-2
x=+8
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