2/5(r-2)=3/20(r-4)

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Solution for 2/5(r-2)=3/20(r-4) equation: 


r in (-oo:+oo)

(2/5)*(r-2) = (3/20)*(r-4) // - (3/20)*(r-4)

(2/5)*(r-2)-((3/20)*(r-4)) = 0

(2/5)*(r-2)+(-3/20)*(r-4) = 0

2/5*(r-2)-3/20*(r-4) = 0

2/5*(r-2)-3/20*(r-4) = 0

1/4*r-1/5 = 0

1/4*r-1/5 = 0

1/4*r-1/5 = 0 // + 1/5

1/4*r = 1/5 // : 1/4

r = 1/5/1/4

r = 4/5

r = 4/5

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