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

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


r in (-oo:+oo)

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

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

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

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

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

-21/2*r-76-2 = 0

-21/2*r-78 = 0

(-21/2*r-78)/5 = 0

(-21/2*r-78)/5 = 0 // * 5

-21/2*r-78 = 0

-21/2*r-78 = 0 // + 78

-21/2*r = 78 // : -21/2

r = 78/(-21/2)

r = -52/7

r = -52/7

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