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r in (-oo:+oo)
3/4-(4*r) = 2*(r-7) // - 2*(r-7)
3/4-(2*(r-7))-(4*r) = 0
3/4-2*(r-7)-4*r = 0
(-2*4*(r-7))/4+(-4*4*r)/4+3/4 = 0
3-2*4*(r-7)-4*4*r = 0
3-24*r+56 = 0
59-24*r = 0
(59-24*r)/4 = 0
(59-24*r)/4 = 0 // * 4
59-24*r = 0
59-24*r = 0 // - 59
-24*r = -59 // : -24
r = -59/(-24)
r = 59/24
r = 59/24
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