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r in (-oo:+oo)
(-5/2)*r+1/4 = (15/4)*r-((1/3)*r)+19/6+1/4 // - (15/4)*r-((1/3)*r)+19/6+1/4
(-5/2)*r-((15/4)*r)+(1/3)*r+1/4-(19/6)-(1/4) = 0
(-5/2)*r+(-15/4)*r+(1/3)*r+1/4-19/6-1/4 = 0
-71/12*r-19/6 = 0 // + 19/6
-71/12*r = 19/6 // : -71/12
r = 19/6/(-71/12)
r = -38/71
r = -38/71
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