r/8+5=4

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Solution for r/8+5=4 equation: 


r in (-oo:+oo)

r/8+5 = 4 // - 4

r/8-4+5 = 0

1/8*r+1 = 0 // - 1

1/8*r = -1 // : 1/8

r = -1/1/8

r = -8

r = -8

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