-4/5r=-21/4

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Solution for -4/5r=-21/4 equation: 


r in (-oo:+oo)

(-4/5)*r = -21/4 // + -21/4

(-4/5)*r-(-21/4) = 0

(-4/5)*r+21/4 = 0

21/4-4/5*r = 0 // - 21/4

-4/5*r = -21/4 // : -4/5

r = -21/4/(-4/5)

r = 105/16

r = 105/16

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