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-339=4x-3(-4x-15)
We move all terms to the left:
-339-(4x-3(-4x-15))=0
We calculate terms in parentheses: -(4x-3(-4x-15)), so:We get rid of parentheses
4x-3(-4x-15)
We multiply parentheses
4x+12x+45
We add all the numbers together, and all the variables
16x+45
Back to the equation:
-(16x+45)
-16x-45-339=0
We add all the numbers together, and all the variables
-16x-384=0
We move all terms containing x to the left, all other terms to the right
-16x=384
x=384/-16
x=-24
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