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(4*x+1)/3 = (12*x-3)/7 // - (12*x-3)/7
(4*x+1)/3-((12*x-3)/7) = 0
(4*x+1)/3+(-1*(12*x-3))/7 = 0
(7*(4*x+1))/(3*7)+(-1*3*(12*x-3))/(3*7) = 0
7*(4*x+1)-1*3*(12*x-3) = 0
16-8*x = 0
(16-8*x)/(3*7) = 0
(16-8*x)/(3*7) = 0 // * 3*7
16-8*x = 0
16-8*x = 0 // - 16
-8*x = -16 // : -8
x = -16/(-8)
x = 2
x = 2
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