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(4x+15)=20
We move all terms to the left:
(4x+15)-(20)=0
We get rid of parentheses
4x+15-20=0
We add all the numbers together, and all the variables
4x-5=0
We move all terms containing x to the left, all other terms to the right
4x=5
x=5/4
x=1+1/4
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