21=4/9x-7

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Solution for 21=4/9x-7 equation: 


x in (-oo:+oo)

21 = (4/9)*x-7 // - (4/9)*x-7

7-((4/9)*x)+21 = 0

(-4/9)*x+7+21 = 0

28-4/9*x = 0 // - 28

-4/9*x = -28 // : -4/9

x = -28/(-4/9)

x = 63

x = 63

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