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90=4x-78
We move all terms to the left:
90-(4x-78)=0
We get rid of parentheses
-4x+78+90=0
We add all the numbers together, and all the variables
-4x+168=0
We move all terms containing x to the left, all other terms to the right
-4x=-168
x=-168/-4
x=+42
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