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15x-90=54-6x
We move all terms to the left:
15x-90-(54-6x)=0
We add all the numbers together, and all the variables
15x-(-6x+54)-90=0
We get rid of parentheses
15x+6x-54-90=0
We add all the numbers together, and all the variables
21x-144=0
We move all terms containing x to the left, all other terms to the right
21x=144
x=144/21
x=6+6/7
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