31/4=r-11/4+1/2r

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Solution for 31/4=r-11/4+1/2r equation: 


r in (-oo:+oo)

31/4 = r+(1/2)*r-(11/4) // - r+(1/2)*r-(11/4)

31/4-r-((1/2)*r)+11/4 = 0

(-1/2)*r-r+31/4+11/4 = 0

21/2-3/2*r = 0 // - 21/2

-3/2*r = -21/2 // : -3/2

r = -21/2/(-3/2)

r = 7

r = 7

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