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120=-3x-6(1+3x)
We move all terms to the left:
120-(-3x-6(1+3x))=0
We add all the numbers together, and all the variables
-(-3x-6(3x+1))+120=0
We calculate terms in parentheses: -(-3x-6(3x+1)), so:We get rid of parentheses
-3x-6(3x+1)
We multiply parentheses
-3x-18x-6
We add all the numbers together, and all the variables
-21x-6
Back to the equation:
-(-21x-6)
21x+6+120=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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