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(x-4)/7 = (x-4)/4 // - (x-4)/4
(x-4)/7-((x-4)/4) = 0
(x-4)/7+(-1*(x-4))/4 = 0
(4*(x-4))/(4*7)+(-1*7*(x-4))/(4*7) = 0
4*(x-4)-1*7*(x-4) = 0
12-3*x = 0
(12-3*x)/(4*7) = 0
(12-3*x)/(4*7) = 0 // * 4*7
12-3*x = 0
12-3*x = 0 // - 12
-3*x = -12 // : -3
x = -12/(-3)
x = 4
x = 4
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