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x in (-oo:+oo)
x/42 = 5/14 // - 5/14
x/42-(5/14) = 0
x/42-5/14 = 0
1/42*x-5/14 = 0 // + 5/14
1/42*x = 5/14 // : 1/42
x = 5/14/1/42
x = 15
x = 15
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