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(1/2)*x-3 = 12/5-((3/4)*x) // - 12/5-((3/4)*x)
(1/2)*x+(3/4)*x-(12/5)-3 = 0
(1/2)*x+(3/4)*x-12/5-3 = 0
5/4*x-27/5 = 0 // + 27/5
5/4*x = 27/5 // : 5/4
x = 27/5/5/4
x = 108/25
x = 108/25
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