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x in (-oo:+oo)
7/5 = x/120 // - x/120
7/5-(x/120) = 0
7/5-1/120*x = 0 // - 7/5
-1/120*x = -7/5 // : -1/120
x = -7/5/(-1/120)
x = 168
x = 168
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