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(1/2)*x-4 = 8/5-((3/4)*x) // - 8/5-((3/4)*x)
(1/2)*x+(3/4)*x-(8/5)-4 = 0
(1/2)*x+(3/4)*x-8/5-4 = 0
5/4*x-28/5 = 0 // + 28/5
5/4*x = 28/5 // : 5/4
x = 28/5/5/4
x = 112/25
x = 112/25
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