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9=x+4(-2x-3)
We move all terms to the left:
9-(x+4(-2x-3))=0
We calculate terms in parentheses: -(x+4(-2x-3)), so:We get rid of parentheses
x+4(-2x-3)
We multiply parentheses
x-8x-12
We add all the numbers together, and all the variables
-7x-12
Back to the equation:
-(-7x-12)
7x+12+9=0
We add all the numbers together, and all the variables
7x+21=0
We move all terms containing x to the left, all other terms to the right
7x=-21
x=-21/7
x=-3
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