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b in (-oo:+oo)
(-4/7)*b+3/5 = (1/3)*b+44/105 // - (1/3)*b+44/105
(-4/7)*b-((1/3)*b)+3/5-(44/105) = 0
(-4/7)*b+(-1/3)*b+3/5-44/105 = 0
19/105-19/21*b = 0 // - 19/105
-19/21*b = -19/105 // : -19/21
b = -19/105/(-19/21)
b = 1/5
b = 1/5
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