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(4x-18)+(2x-75)=90
We move all terms to the left:
(4x-18)+(2x-75)-(90)=0
We get rid of parentheses
4x+2x-18-75-90=0
We add all the numbers together, and all the variables
6x-183=0
We move all terms containing x to the left, all other terms to the right
6x=183
x=183/6
x=30+1/2
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