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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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