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x in (-oo:+oo)
4/7 = x/42 // - x/42
4/7-(x/42) = 0
4/7-1/42*x = 0 // - 4/7
-1/42*x = -4/7 // : -1/42
x = -4/7/(-1/42)
x = 24
x = 24
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