-3/10r=-12

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Solution for -3/10r=-12 equation: 


r in (-oo:+oo)

(-3/10)*r = -12 // + 12

(-3/10)*r+12 = 0

12-3/10*r = 0 // - 12

-3/10*r = -12 // : -3/10

r = -12/(-3/10)

r = 40

r = 40

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