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(2*x-2)/7+(5*v-7)/3 = 13 // - 13
(2*x-2)/7+(5*v-7)/3-13 = 0
(3*(2*x-2))/(3*7)+(7*(5*v-7))/(3*7)+(-13*3*7)/(3*7) = 0
3*(2*x-2)+7*(5*v-7)-13*3*7 = 0
35*v+6*x-273-55 = 0
35*v+6*x-328 = 0
(35*v+6*x-328)/(3*7) = 0
(35*v+6*x-328)/(3*7) = 0 // * 3*7
35*v+6*x-328 = 0
35*v+6*x-328 = 0 // - 35*v-328
6*x = -(35*v-328) // : 6
x = (-(35*v-328))/6
x = (328-(35*v))/6
x = (328-(35*v))/6
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