21=4g/9

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Solution for 21=4g/9 equation: 


g in (-oo:+oo)

21 = (4*g)/9 // - (4*g)/9

21-((4*g)/9) = 0

(-4/9)*g+21 = 0

21-4/9*g = 0 // - 21

-4/9*g = -21 // : -4/9

g = -21/(-4/9)

g = 189/4

g = 189/4

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