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142-2x=12x+2
We move all terms to the left:
142-2x-(12x+2)=0
We get rid of parentheses
-2x-12x-2+142=0
We add all the numbers together, and all the variables
-14x+140=0
We move all terms containing x to the left, all other terms to the right
-14x=-140
x=-140/-14
x=+10
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