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(1/2)*(5*x+12) = 26 // - 26
(1/2)*(5*x+12)-26 = 0
1/2*(5*x+12)-26 = 0
1/2*(5*x+12)-26 = 0
5/2*x-20 = 0
5/2*x-20 = 0
5/2*x-20 = 0 // + 20
5/2*x = 20 // : 5/2
x = 20/5/2
x = 8
x = 8
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