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x in (-oo:+oo)
37/42 = (1/42)*x // - (1/42)*x
37/42-((1/42)*x) = 0
(-1/42)*x+37/42 = 0
37/42-1/42*x = 0 // - 37/42
-1/42*x = -37/42 // : -1/42
x = -37/42/(-1/42)
x = 37
x = 37
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