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-135=-6x-3(7x+15)
We move all terms to the left:
-135-(-6x-3(7x+15))=0
We calculate terms in parentheses: -(-6x-3(7x+15)), so:We get rid of parentheses
-6x-3(7x+15)
We multiply parentheses
-6x-21x-45
We add all the numbers together, and all the variables
-27x-45
Back to the equation:
-(-27x-45)
27x+45-135=0
We add all the numbers together, and all the variables
27x-90=0
We move all terms containing x to the left, all other terms to the right
27x=90
x=90/27
x=3+1/3
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