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

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

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

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

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

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

-r-4 = 0

(-r-4)/5 = 0

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

-r-4 = 0

-r-4 = 0 // + 4

-r = 4 // * -1

r = -4

r = -4

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