4/5x-9=-21 - solution

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

x in (-oo:+oo)

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

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