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20-3x=35-8x
We move all terms to the left:
20-3x-(35-8x)=0
We add all the numbers together, and all the variables
-3x-(-8x+35)+20=0
We get rid of parentheses
-3x+8x-35+20=0
We add all the numbers together, and all the variables
5x-15=0
We move all terms containing x to the left, all other terms to the right
5x=15
x=15/5
x=3
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