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3(X+5)+(12X)=90
We move all terms to the left:
3(X+5)+(12X)-(90)=0
We add all the numbers together, and all the variables
12X+3(X+5)-90=0
We multiply parentheses
12X+3X+15-90=0
We add all the numbers together, and all the variables
15X-75=0
We move all terms containing X to the left, all other terms to the right
15X=75
X=75/15
X=5
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