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128=3x+5(3x-4)
We move all terms to the left:
128-(3x+5(3x-4))=0
We calculate terms in parentheses: -(3x+5(3x-4)), so:We get rid of parentheses
3x+5(3x-4)
We multiply parentheses
3x+15x-20
We add all the numbers together, and all the variables
18x-20
Back to the equation:
-(18x-20)
-18x+20+128=0
We add all the numbers together, and all the variables
-18x+148=0
We move all terms containing x to the left, all other terms to the right
-18x=-148
x=-148/-18
x=8+2/9
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