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(3x-15)+(2x)=90
We move all terms to the left:
(3x-15)+(2x)-(90)=0
We add all the numbers together, and all the variables
2x+(3x-15)-90=0
We get rid of parentheses
2x+3x-15-90=0
We add all the numbers together, and all the variables
5x-105=0
We move all terms containing x to the left, all other terms to the right
5x=105
x=105/5
x=21
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