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(1/2)*(x-8)-15 = -13 // + 13
(1/2)*(x-8)-15+13 = 0
1/2*(x-8)-15+13 = 0
1/2*(x-8)-15+13 = 0
1/2*x-19+13 = 0
1/2*x-6 = 0
1/2*x-6 = 0
1/2*x-6 = 0 // + 6
1/2*x = 6 // : 1/2
x = 6/1/2
x = 12
x = 12
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