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3x+2+9x=-7
Add 9x to both sides.
12x+2=-7
Combine 3x and 9x to get 12x.
12x=-7-2
Subtract 2 from both sides.
12x=-9
Subtract 2 from -7 to get -9.
x=\frac{-9}{12}
Divide both sides by 12.
x=-\frac{3}{4}
Reduce the fraction \frac{-9}{12} to lowest terms by extracting and canceling out 3.