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(1/8)*x+(3/8)*x-4-4 = 5 // - 5
(1/8)*x+(3/8)*x-5-4-4 = 0
1/2*x-13 = 0 // + 13
1/2*x = 13 // : 1/2
x = 13/1/2
x = 26
x = 26
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