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x in (-oo:+oo)
76-(42*x) = 70/14 // - 70/14
76-(42*x)-(70/14) = 0
76-42*x-5 = 0
71-42*x = 0 // - 71
-42*x = -71 // : -42
x = -71/(-42)
x = 71/42
x = 71/42
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