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x in (-oo:+oo)
(-7/31)*x = 1 // - 1
(-7/31)*x-1 = 0
-7/31*x-1 = 0 // + 1
-7/31*x = 1 // : -7/31
x = 1/(-7/31)
x = -31/7
x = -31/7
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