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13-3x=-4(2x+3)
We move all terms to the left:
13-3x-(-4(2x+3))=0
We calculate terms in parentheses: -(-4(2x+3)), so:We get rid of parentheses
-4(2x+3)
We multiply parentheses
-8x-12
Back to the equation:
-(-8x-12)
-3x+8x+12+13=0
We add all the numbers together, and all the variables
5x+25=0
We move all terms containing x to the left, all other terms to the right
5x=-25
x=-25/5
x=-5
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