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x in (-oo:+oo)
x/12-3 = 7/14 // - 7/14
x/12-(7/14)-3 = 0
x/12-1/2-3 = 0
1/12*x-7/2 = 0 // + 7/2
1/12*x = 7/2 // : 1/12
x = 7/2/1/12
x = 42
x = 42
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