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(1/24)*(3*x+9*x+12) = 13 // - 13
(1/24)*(3*x+9*x+12)-13 = 0
1/24*(12*x+12)-13 = 0
1/24*(12*x+12)-13 = 0
1/2*x-25/2 = 0
1/2*x-25/2 = 0
1/2*x-25/2 = 0 // + 25/2
1/2*x = 25/2 // : 1/2
x = 25/2/1/2
x = 25
x = 25
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