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(4x-18)=20
We move all terms to the left:
(4x-18)-(20)=0
We get rid of parentheses
4x-18-20=0
We add all the numbers together, and all the variables
4x-38=0
We move all terms containing x to the left, all other terms to the right
4x=38
x=38/4
x=9+1/2
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