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x in (-oo:+oo)
40/100 = x/70 // - x/70
40/100-(x/70) = 0
2/5-1/70*x = 0 // - 2/5
-1/70*x = -2/5 // : -1/70
x = -2/5/(-1/70)
x = 28
x = 28
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