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(11/4)*x-15 = 5-((5/4)*x) // - 5-((5/4)*x)
(11/4)*x+(5/4)*x-15-5 = 0
4*x-20 = 0 // + 20
4*x = 20 // : 4
x = 20/4
x = 5
x = 5
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