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x+20=4x-15
We move all terms to the left:
x+20-(4x-15)=0
We get rid of parentheses
x-4x+15+20=0
We add all the numbers together, and all the variables
-3x+35=0
We move all terms containing x to the left, all other terms to the right
-3x=-35
x=-35/-3
x=11+2/3
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