-4/7r=-12 - solution

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Solution for -4/7r=-12 equation:

r in (-oo:+oo)

(-4/7)*r = -12 // + 12

(-4/7)*r+12 = 0

12-4/7*r = 0 // - 12

-4/7*r = -12 // : -4/7

r = -12/(-4/7)

r = 21

r = 21

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