r/3+7=-4

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Solution for r/3+7=-4 equation: 


r in (-oo:+oo)

r/3+7 = -4 // + 4

r/3+4+7 = 0

1/3*r+11 = 0 // - 11

1/3*r = -11 // : 1/3

r = -11/1/3

r = -33

r = -33

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