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x in (-oo:+oo)
5/7 = x/70 // - x/70
5/7-(x/70) = 0
5/7-1/70*x = 0 // - 5/7
-1/70*x = -5/7 // : -1/70
x = -5/7/(-1/70)
x = 50
x = 50
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