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x in (-oo:+oo)
x/6+x/12 = 18/36 // - 18/36
x/6+x/12-(18/36) = 0
x/6+x/12-1/2 = 0
1/4*x-1/2 = 0 // + 1/2
1/4*x = 1/2 // : 1/4
x = 1/2/1/4
x = 2
x = 2
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