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90=4x-7
We move all terms to the left:
90-(4x-7)=0
We get rid of parentheses
-4x+7+90=0
We add all the numbers together, and all the variables
-4x+97=0
We move all terms containing x to the left, all other terms to the right
-4x=-97
x=-97/-4
x=24+1/4
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