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(85-x)=4x
We move all terms to the left:
(85-x)-(4x)=0
We add all the numbers together, and all the variables
(-1x+85)-4x=0
We add all the numbers together, and all the variables
-4x+(-1x+85)=0
We get rid of parentheses
-4x-1x+85=0
We add all the numbers together, and all the variables
-5x+85=0
We move all terms containing x to the left, all other terms to the right
-5x=-85
x=-85/-5
x=+17
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