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x in (-oo:+oo)
x/(-5) = -3.5 // + 3.5
x/(-5)+3.5 = 0
3.5-1/5*x = 0 // - 3.5
-1/5*x = -3.5 // : -1/5
x = -3.5/(-1/5)
x = 17.5
x = 17.5
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