r/3+7=12

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Solution for r/3+7=12 equation: 


r in (-oo:+oo)

r/3+7 = 12 // - 12

r/3-12+7 = 0

1/3*r-5 = 0 // + 5

1/3*r = 5 // : 1/3

r = 5/1/3

r = 15

r = 15

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