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13x+20=-16+16x
We move all terms to the left:
13x+20-(-16+16x)=0
We add all the numbers together, and all the variables
13x-(16x-16)+20=0
We get rid of parentheses
13x-16x+16+20=0
We add all the numbers together, and all the variables
-3x+36=0
We move all terms containing x to the left, all other terms to the right
-3x=-36
x=-36/-3
x=+12
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