4=-2/9u

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Solution for 4=-2/9u equation: 


u in (-oo:+oo)

4 = (-2/9)*u // - (-2/9)*u

4-((-2/9)*u) = 0

(2/9)*u+4 = 0

2/9*u+4 = 0 // - 4

2/9*u = -4 // : 2/9

u = -4/2/9

u = -18

u = -18

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