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v in (-oo:+oo)
(3*v-6)/7+(5*v-5)/4 = 13 // - 13
(3*v-6)/7+(5*v-5)/4-13 = 0
(4*(3*v-6))/(4*7)+(7*(5*v-5))/(4*7)+(-13*4*7)/(4*7) = 0
4*(3*v-6)+7*(5*v-5)-13*4*7 = 0
47*v-364-59 = 0
47*v-423 = 0
(47*v-423)/(4*7) = 0
(47*v-423)/(4*7) = 0 // * 4*7
47*v-423 = 0
47*v-423 = 0 // + 423
47*v = 423 // : 47
v = 423/47
v = 9
v = 9
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