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x in (-oo:+oo)
x/2+3/2 = 9 // - 9
x/2+3/2-9 = 0
1/2*x-15/2 = 0 // + 15/2
1/2*x = 15/2 // : 1/2
x = 15/2/1/2
x = 15
x = 15
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