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(x-5)+(3x-5)=90
We move all terms to the left:
(x-5)+(3x-5)-(90)=0
We get rid of parentheses
x+3x-5-5-90=0
We add all the numbers together, and all the variables
4x-100=0
We move all terms containing x to the left, all other terms to the right
4x=100
x=100/4
x=25
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