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r in (-oo:+oo)
1/4-3/4 = (-7/8)*r+(3/8)*r // - (-7/8)*r+(3/8)*r
1/4-((-7/8)*r)-((3/8)*r)-3/4 = 0
(7/8)*r+(-3/8)*r-3/4+1/4 = 0
1/2*r-1/2 = 0 // + 1/2
1/2*r = 1/2 // : 1/2
r = 1/2/1/2
r = 1
r = 1
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