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x in (-oo:+oo)
x/12 = 324/18 // - 324/18
x/12-(324/18) = 0
x/12-18 = 0
1/12*x-18 = 0 // + 18
1/12*x = 18 // : 1/12
x = 18/1/12
x = 216
x = 216
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