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4x+23=-3(4x+3)
We move all terms to the left:
4x+23-(-3(4x+3))=0
We calculate terms in parentheses: -(-3(4x+3)), so:We get rid of parentheses
-3(4x+3)
We multiply parentheses
-12x-9
Back to the equation:
-(-12x-9)
4x+12x+9+23=0
We add all the numbers together, and all the variables
16x+32=0
We move all terms containing x to the left, all other terms to the right
16x=-32
x=-32/16
x=-2
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