-2r/8=30/4

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Solution for -2r/8=30/4 equation: 


r in (-oo:+oo)

(-2*r)/8 = 30/4 // - 30/4

(-2*r)/8-(30/4) = 0

(-2*r)/8-15/2 = 0

-1/4*r-15/2 = 0 // + 15/2

-1/4*r = 15/2 // : -1/4

r = 15/2/(-1/4)

r = -30

r = -30

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