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4*(x-3) = 3*(x/7) // - 3*(x/7)
4*(x-3)-(3*(x/7)) = 0
4*(x-3)+(-3/7)*x = 0
4*(x-3)+(-3*x)/7 = 0
(4*7*(x-3))/7+(-3*x)/7 = 0
4*7*(x-3)-3*x = 0
25*x-84 = 0
(25*x-84)/7 = 0
(25*x-84)/7 = 0 // * 7
25*x-84 = 0
25*x-84 = 0 // + 84
25*x = 84 // : 25
x = 84/25
x = 84/25
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