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x in (-oo:+oo)
12+28 = x/10+3/10 // - x/10+3/10
12-(x/10)-(3/10)+28 = 0
12-(x/10)-3/10+28 = 0
397/10-1/10*x = 0 // - 397/10
-1/10*x = -397/10 // : -1/10
x = -397/10/(-1/10)
x = 397
x = 397
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