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129-14x=15x+13
We move all terms to the left:
129-14x-(15x+13)=0
We get rid of parentheses
-14x-15x-13+129=0
We add all the numbers together, and all the variables
-29x+116=0
We move all terms containing x to the left, all other terms to the right
-29x=-116
x=-116/-29
x=+4
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