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11(x+13)=12x+4
We move all terms to the left:
11(x+13)-(12x+4)=0
We multiply parentheses
11x-(12x+4)+143=0
We get rid of parentheses
11x-12x-4+143=0
We add all the numbers together, and all the variables
-1x+139=0
We move all terms containing x to the left, all other terms to the right
-x=-139
x=-139/-1
x=+139
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