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90=6x-3=105
We move all terms to the left:
90-(6x-3)=0
We get rid of parentheses
-6x+3+90=0
We add all the numbers together, and all the variables
-6x+93=0
We move all terms containing x to the left, all other terms to the right
-6x=-93
x=-93/-6
x=15+1/2
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