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12=90-6x
We move all terms to the left:
12-(90-6x)=0
We add all the numbers together, and all the variables
-(-6x+90)+12=0
We get rid of parentheses
6x-90+12=0
We add all the numbers together, and all the variables
6x-78=0
We move all terms containing x to the left, all other terms to the right
6x=78
x=78/6
x=13
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