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x in (-oo:+oo)
2*x = 15/2 // - 15/2
2*x-(15/2) = 0
2*x-15/2 = 0
2*x-15/2 = 0 // + 15/2
2*x = 15/2 // : 2
x = 15/2/2
x = 15/4
x = 15/4
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