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-105=-3x+4(5x+12)
We move all terms to the left:
-105-(-3x+4(5x+12))=0
We calculate terms in parentheses: -(-3x+4(5x+12)), so:We get rid of parentheses
-3x+4(5x+12)
We multiply parentheses
-3x+20x+48
We add all the numbers together, and all the variables
17x+48
Back to the equation:
-(17x+48)
-17x-48-105=0
We add all the numbers together, and all the variables
-17x-153=0
We move all terms containing x to the left, all other terms to the right
-17x=153
x=153/-17
x=-9
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