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b in (-oo:+oo)
(-3/5)*b+7/10 = 13/25 // - 13/25
(-3/5)*b+7/10-(13/25) = 0
(-3/5)*b+7/10-13/25 = 0
9/50-3/5*b = 0 // - 9/50
-3/5*b = -9/50 // : -3/5
b = -9/50/(-3/5)
b = 3/10
b = 3/10
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