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x in (-oo:+oo)
3/7 = x/140 // - x/140
3/7-(x/140) = 0
3/7-1/140*x = 0 // - 3/7
-1/140*x = -3/7 // : -1/140
x = -3/7/(-1/140)
x = 60
x = 60
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