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