18=-4/9x

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Solution for 18=-4/9x equation: 


x in (-oo:+oo)

18 = (-4/9)*x // - (-4/9)*x

18-((-4/9)*x) = 0

(4/9)*x+18 = 0

4/9*x+18 = 0 // - 18

4/9*x = -18 // : 4/9

x = -18/4/9

x = -81/2

x = -81/2

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