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b in (-oo:+oo)
(-3/5)*b+1/10 = -1/10 // + -1/10
(-3/5)*b+1/10-(-1/10) = 0
(-3/5)*b+1/10+1/10 = 0
1/5-3/5*b = 0 // - 1/5
-3/5*b = -1/5 // : -3/5
b = -1/5/(-3/5)
b = 1/3
b = 1/3
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