4r-2/5=1-2r

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Solution for 4r-2/5=1-2r equation: 


r in (-oo:+oo)

4*r-(2/5) = 1-(2*r) // - 1-(2*r)

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

4*r+2*r-2/5-1 = 0

6*r-7/5 = 0 // + 7/5

6*r = 7/5 // : 6

r = 7/5/6

r = 7/30

r = 7/30

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