4/5x+9=21

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Solution for 4/5x+9=21 equation: 


x in (-oo:+oo)

(4/5)*x+9 = 21 // - 21

(4/5)*x-21+9 = 0

4/5*x-12 = 0 // + 12

4/5*x = 12 // : 4/5

x = 12/4/5

x = 15

x = 15

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