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-3x-7-x<9
Subtract x from both sides.
-4x-7<9
Combine -3x and -x to get -4x.
-4x<9+7
Add 7 to both sides.
-4x<16
Add 9 and 7 to get 16.
x>\frac{16}{-4}
Divide both sides by -4. Since -4 is negative, the inequality direction is changed.
x>-4
Divide 16 by -4 to get -4.