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