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x in (-oo:+oo)
x/12 = 21/36 // - 21/36
x/12-(21/36) = 0
x/12-7/12 = 0
1/12*x-7/12 = 0 // + 7/12
1/12*x = 7/12 // : 1/12
x = 7/12/1/12
x = 7
x = 7
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