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15=4x-90
We move all terms to the left:
15-(4x-90)=0
We get rid of parentheses
-4x+90+15=0
We add all the numbers together, and all the variables
-4x+105=0
We move all terms containing x to the left, all other terms to the right
-4x=-105
x=-105/-4
x=26+1/4
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