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3x+7=0
Combine 2x and x to get 3x.
3x=-7
Subtract 7 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-7}{3}
Divide both sides by 3.
x=-\frac{7}{3}
Fraction \frac{-7}{3} can be rewritten as -\frac{7}{3} by extracting the negative sign.