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4x+20=15x-11
We move all terms to the left:
4x+20-(15x-11)=0
We get rid of parentheses
4x-15x+11+20=0
We add all the numbers together, and all the variables
-11x+31=0
We move all terms containing x to the left, all other terms to the right
-11x=-31
x=-31/-11
x=2+9/11
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