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15-13x=16+12x
We move all terms to the left:
15-13x-(16+12x)=0
We add all the numbers together, and all the variables
-13x-(12x+16)+15=0
We get rid of parentheses
-13x-12x-16+15=0
We add all the numbers together, and all the variables
-25x-1=0
We move all terms containing x to the left, all other terms to the right
-25x=1
x=1/-25
x=-1/25
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