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(3/7)*(x-4) = (5/3)*(x+1) // - (5/3)*(x+1)
(3/7)*(x-4)-((5/3)*(x+1)) = 0
(3/7)*(x-4)+(-5/3)*(x+1) = 0
3/7*(x-4)-5/3*(x+1) = 0
3/7*(x-4)-5/3*(x+1) = 0
-26/21*x-71/21 = 0
-26/21*x-71/21 = 0
-26/21*x-71/21 = 0 // + 71/21
-26/21*x = 71/21 // : -26/21
x = 71/21/(-26/21)
x = -71/26
x = -71/26
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