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(4/7)*(x-4)+5/6 = (1/6)*(x+1) // - (1/6)*(x+1)
(4/7)*(x-4)-((1/6)*(x+1))+5/6 = 0
(4/7)*(x-4)+(-1/6)*(x+1)+5/6 = 0
4/7*(x-4)-1/6*(x+1)+5/6 = 0
(4/7*6*(x-4))/6+(-1/6*6*(x+1))/6+5/6 = 0
4/7*6*(x-4)-1/6*6*(x+1)+5 = 0
17/7*x-103/7+5 = 0
17/7*x-68/7 = 0
(17/7*x-68/7)/6 = 0
(17/7*x-68/7)/6 = 0 // * 6
17/7*x-68/7 = 0
17/7*x-68/7 = 0 // + 68/7
17/7*x = 68/7 // : 17/7
x = 68/7/17/7
x = 4
x = 4
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