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x in (-oo:+oo)
2/7 = x/16 // - x/16
2/7-(x/16) = 0
2/7-1/16*x = 0 // - 2/7
-1/16*x = -2/7 // : -1/16
x = -2/7/(-1/16)
x = 32/7
x = 32/7
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