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r in (-oo:+oo)
3-((25*r)/4) = -((-3*r)/4-1) // + (-3*r)/4-1
(-3*r)/4-((25*r)/4)-1+3 = 0
(-25/4)*r+(-3*r)/4-1+3 = 0
2-7*r = 0 // - 2
-7*r = -2 // : -7
r = -2/(-7)
r = 2/7
r = 2/7
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