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198=-6x+3(-7x-18)
We move all terms to the left:
198-(-6x+3(-7x-18))=0
We calculate terms in parentheses: -(-6x+3(-7x-18)), so:We get rid of parentheses
-6x+3(-7x-18)
We multiply parentheses
-6x-21x-54
We add all the numbers together, and all the variables
-27x-54
Back to the equation:
-(-27x-54)
27x+54+198=0
We add all the numbers together, and all the variables
27x+252=0
We move all terms containing x to the left, all other terms to the right
27x=-252
x=-252/27
x=-9+1/3
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