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r in (-oo:+oo)
-(7*r)-13/2 = (-5*r)/4-((1/4)*(-9*r-2)) // - (-5*r)/4-((1/4)*(-9*r-2))
(1/4)*(-9*r-2)-(7*r)-((-5*r)/4)-13/2 = 0
(1/4)*(-9*r-2)-7*r+(5/4)*r-13/2 = 0
1/4*(-9*r-2)-7*r+(5*r)/4-13/2 = 0
(1/4*2*4*(-9*r-2))/(2*4)+(-7*2*4*r)/(2*4)+(2*5*r)/(2*4)+(-13*4)/(2*4) = 0
1/4*2*4*(-9*r-2)-7*2*4*r+2*5*r-13*4 = 0
10*r-74*r-52-4 = 0
-64*r-52-4 = 0
-64*r-56 = 0
(-64*r-56)/(2*4) = 0
(-64*r-56)/(2*4) = 0 // * 2*4
-64*r-56 = 0
-64*r-56 = 0 // + 56
-64*r = 56 // : -64
r = 56/(-64)
r = -7/8
r = -7/8
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