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(x-20)+(185-2x)=90
We move all terms to the left:
(x-20)+(185-2x)-(90)=0
We add all the numbers together, and all the variables
(x-20)+(-2x+185)-90=0
We get rid of parentheses
x-2x-20+185-90=0
We add all the numbers together, and all the variables
-1x+75=0
We move all terms containing x to the left, all other terms to the right
-x=-75
x=-75/-1
x=+75
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