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86=5x-4
We move all terms to the left:
86-(5x-4)=0
We get rid of parentheses
-5x+4+86=0
We add all the numbers together, and all the variables
-5x+90=0
We move all terms containing x to the left, all other terms to the right
-5x=-90
x=-90/-5
x=+18
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