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20+9x=0
Add 2 and 18 to get 20.
9x=-20
Subtract 20 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-20}{9}
Divide both sides by 9.
x=-\frac{20}{9}
Fraction \frac{-20}{9} can be rewritten as -\frac{20}{9} by extracting the negative sign.