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(5/4)*(x+8) = 12 // - 12
(5/4)*(x+8)-12 = 0
5/4*(x+8)-12 = 0
5/4*(x+8)-12 = 0
5/4*x-2 = 0
5/4*x-2 = 0
5/4*x-2 = 0 // + 2
5/4*x = 2 // : 5/4
x = 2/5/4
x = 8/5
x = 8/5
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