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3x=7-15
Subtract 15 from both sides.
3x=-8
Subtract 15 from 7 to get -8.
x=\frac{-8}{3}
Divide both sides by 3.
x=-\frac{8}{3}
Fraction \frac{-8}{3} can be rewritten as -\frac{8}{3} by extracting the negative sign.