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(10x-5)+(5x-5)=90
We move all terms to the left:
(10x-5)+(5x-5)-(90)=0
We get rid of parentheses
10x+5x-5-5-90=0
We add all the numbers together, and all the variables
15x-100=0
We move all terms containing x to the left, all other terms to the right
15x=100
x=100/15
x=6+2/3
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