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x=85x-4
We move all terms to the left:
x-(85x-4)=0
We get rid of parentheses
x-85x+4=0
We add all the numbers together, and all the variables
-84x+4=0
We move all terms containing x to the left, all other terms to the right
-84x=-4
x=-4/-84
x=1/21
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