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(1/39)*(12-(6*x)) = 4-(2*x) // - 4-(2*x)
(1/39)*(12-(6*x))+2*x-4 = 0
(1/39)*(12-6*x)+2*x-4 = 0
1/39*(12-6*x)+2*x-4 = 0
1/39*(12-6*x)+2*x-4 = 0
24/13*x-4+4/13 = 0
24/13*x-48/13 = 0
24/13*x-48/13 = 0
24/13*x-48/13 = 0 // + 48/13
24/13*x = 48/13 // : 24/13
x = 48/13/24/13
x = 2
x = 2
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