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x in (-oo:+oo)
x/42 = 41/84 // - 41/84
x/42-(41/84) = 0
x/42-41/84 = 0
1/42*x-41/84 = 0 // + 41/84
1/42*x = 41/84 // : 1/42
x = 41/84/1/42
x = 41/2
x = 41/2
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