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