3/10r=12 - solution

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Solution for 3/10r=12 equation:

r in (-oo:+oo)

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

(3/10)*r-12 = 0

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

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

r = 12/3/10

r = 40

r = 40

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