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136=12x+28
We move all terms to the left:
136-(12x+28)=0
We get rid of parentheses
-12x-28+136=0
We add all the numbers together, and all the variables
-12x+108=0
We move all terms containing x to the left, all other terms to the right
-12x=-108
x=-108/-12
x=+9
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