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12X=3(5+4X)-15
We move all terms to the left:
12X-(3(5+4X)-15)=0
We add all the numbers together, and all the variables
12X-(3(4X+5)-15)=0
We calculate terms in parentheses: -(3(4X+5)-15), so:We add all the numbers together, and all the variables
3(4X+5)-15
We multiply parentheses
12X+15-15
We add all the numbers together, and all the variables
12X
Back to the equation:
-(12X)
=0
X=0/1
X=0
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