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90=2x+4
We move all terms to the left:
90-(2x+4)=0
We get rid of parentheses
-2x-4+90=0
We add all the numbers together, and all the variables
-2x+86=0
We move all terms containing x to the left, all other terms to the right
-2x=-86
x=-86/-2
x=+43
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