20=-4/9x

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Solution for 20=-4/9x equation: 


x in (-oo:+oo)

20 = (-4/9)*x // - (-4/9)*x

20-((-4/9)*x) = 0

(4/9)*x+20 = 0

4/9*x+20 = 0 // - 20

4/9*x = -20 // : 4/9

x = -20/4/9

x = -45

x = -45

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