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