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x in (-oo:+oo)
80-(x/9) = x/7 // - x/7
80-(x/9)-(x/7) = 0
80-16/63*x = 0 // - 80
-16/63*x = -80 // : -16/63
x = -80/(-16/63)
x = 315
x = 315
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