-1/20(r+20)-2/5(4r+13)=2/5

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Solution for -1/20(r+20)-2/5(4r+13)=2/5 equation: 


r in (-oo:+oo)

(-1/20)*(r+20)-((2/5)*(4*r+13)) = 2/5 // - 2/5

(-1/20)*(r+20)-((2/5)*(4*r+13))-(2/5) = 0

(-1/20)*(r+20)+(-2/5)*(4*r+13)-2/5 = 0

-1/20*(r+20)-2/5*(4*r+13)-2/5 = 0

(-1/20*5*(r+20))/5+(-2/5*5*(4*r+13))/5-2/5 = 0

-1/20*5*(r+20)-2/5*5*(4*r+13)-2 = 0

-33/4*r-31-2 = 0

-33/4*r-33 = 0

(-33/4*r-33)/5 = 0

(-33/4*r-33)/5 = 0 // * 5

-33/4*r-33 = 0

-33/4*r-33 = 0 // + 33

-33/4*r = 33 // : -33/4

r = 33/(-33/4)

r = -4

r = -4

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