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x in (-oo:+oo)
x/12 = 7/36 // - 7/36
x/12-(7/36) = 0
x/12-7/36 = 0
1/12*x-7/36 = 0 // + 7/36
1/12*x = 7/36 // : 1/12
x = 7/36/1/12
x = 7/3
x = 7/3
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