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x in (-oo:+oo)
5*x-(5/2) = 15 // - 15
5*x-(5/2)-15 = 0
5*x-5/2-15 = 0
5*x-35/2 = 0 // + 35/2
5*x = 35/2 // : 5
x = 35/2/5
x = 7/2
x = 7/2
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