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28*x-((4/8)*x)-8 = 7/2 // - 7/2
28*x-((4/8)*x)-(7/2)-8 = 0
28*x+(-1/2)*x-7/2-8 = 0
55/2*x-23/2 = 0 // + 23/2
55/2*x = 23/2 // : 55/2
x = 23/2/55/2
x = 23/55
x = 23/55
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