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x in (-oo:+oo)
x/12+1/6 = 7/12 // - 7/12
x/12+1/6-(7/12) = 0
x/12+1/6-7/12 = 0
1/12*x-5/12 = 0 // + 5/12
1/12*x = 5/12 // : 1/12
x = 5/12/1/12
x = 5
x = 5
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