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x in (-oo:+oo)
10/20 = x/70 // - x/70
10/20-(x/70) = 0
1/2-1/70*x = 0 // - 1/2
-1/70*x = -1/2 // : -1/70
x = -1/2/(-1/70)
x = 35
x = 35
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