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x in (-oo:+oo)
x/2 = 18/7 // - 18/7
x/2-(18/7) = 0
x/2-18/7 = 0
1/2*x-18/7 = 0 // + 18/7
1/2*x = 18/7 // : 1/2
x = 18/7/1/2
x = 36/7
x = 36/7
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