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(1/2)*(x-6) = (1/4)*x-(2/5) // - (1/4)*x-(2/5)
(1/2)*(x-6)-((1/4)*x)+2/5 = 0
(1/2)*(x-6)+(-1/4)*x+2/5 = 0
1/2*(x-6)-x/4+2/5 = 0
(1/2*4*5*(x-6))/(4*5)+(5*(-x))/(4*5)+(2*4)/(4*5) = 0
1/2*4*5*(x-6)+5*(-x)+2*4 = 0
5*x-60+8 = 0
5*x-52 = 0
(5*x-52)/(4*5) = 0
(5*x-52)/(4*5) = 0 // * 4*5
5*x-52 = 0
5*x-52 = 0 // + 52
5*x = 52 // : 5
x = 52/5
x = 52/5
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