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(x+6)/3+(3*x)/4 = 25/12 // - 25/12
(x+6)/3+(3*x)/4-(25/12) = 0
(x+6)/3+(3*x)/4-25/12 = 0
(4*12*(x+6))/(3*4*12)+(3*3*12*x)/(3*4*12)+(-25*3*4)/(3*4*12) = 0
4*12*(x+6)+3*3*12*x-25*3*4 = 0
156*x-300+288 = 0
156*x-12 = 0
(156*x-12)/(3*4*12) = 0
(156*x-12)/(3*4*12) = 0 // * 3*4*12
156*x-12 = 0
156*x-12 = 0 // + 12
156*x = 12 // : 156
x = 12/156
x = 1/13
x = 1/13
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