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20-2x=56-5x
We move all terms to the left:
20-2x-(56-5x)=0
We add all the numbers together, and all the variables
-2x-(-5x+56)+20=0
We get rid of parentheses
-2x+5x-56+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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