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72=9(-3x)-2(3-6x)
We move all terms to the left:
72-(9(-3x)-2(3-6x))=0
We add all the numbers together, and all the variables
-(9(-3x)-2(-6x+3))+72=0
We calculate terms in parentheses: -(9(-3x)-2(-6x+3)), so:We get rid of parentheses
9(-3x)-2(-6x+3)
We multiply parentheses
-27x+12x-6
We add all the numbers together, and all the variables
-15x-6
Back to the equation:
-(-15x-6)
15x+6+72=0
We add all the numbers together, and all the variables
15x+78=0
We move all terms containing x to the left, all other terms to the right
15x=-78
x=-78/15
x=-5+1/5
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