9x/21=-3 - solution

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Solution for 9x/21=-3 equation:

x in (-oo:+oo)

(9*x)/21 = -3 // + 3

(9*x)/21+3 = 0

3/7*x+3 = 0 // - 3

3/7*x = -3 // : 3/7

x = -3/3/7

x = -7

x = -7

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