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3x-2=\frac{-80}{-2}
Divide both sides by -2.
3x-2=40
Divide -80 by -2 to get 40.
3x=40+2
Add 2 to both sides.
3x=42
Add 40 and 2 to get 42.
x=\frac{42}{3}
Divide both sides by 3.
x=14
Divide 42 by 3 to get 14.