2x - 3 (-4 + 3x) = -9

how to solve it
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1 Answer

Expand the parentheses:

2x+12-9x=-9, -7x+12=-9, add 9 to each side: -7x+21=0, add 7x to each side: 21=7x, divide both sides by 7: 3=x, so x=3 is the solution.

 

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