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180=3x+6(-4x+9)
We move all terms to the left:
180-(3x+6(-4x+9))=0
We calculate terms in parentheses: -(3x+6(-4x+9)), so:We get rid of parentheses
3x+6(-4x+9)
We multiply parentheses
3x-24x+54
We add all the numbers together, and all the variables
-21x+54
Back to the equation:
-(-21x+54)
21x-54+180=0
We add all the numbers together, and all the variables
21x+126=0
We move all terms containing x to the left, all other terms to the right
21x=-126
x=-126/21
x=-6
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