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15x=3x+90
We move all terms to the left:
15x-(3x+90)=0
We get rid of parentheses
15x-3x-90=0
We add all the numbers together, and all the variables
12x-90=0
We move all terms containing x to the left, all other terms to the right
12x=90
x=90/12
x=7+1/2
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