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x in (-oo:+oo)
(x/1)/2 = 15 // - 15
(x/1)/2-15 = 0
x/2-15 = 0
1/2*x-15 = 0 // + 15
1/2*x = 15 // : 1/2
x = 15/1/2
x = 30
x = 30
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