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b in (-oo:+oo)
1/10-((2/5)*b) = 7/30 // - 7/30
1/10-((2/5)*b)-(7/30) = 0
(-2/5)*b+1/10-7/30 = 0
-2/5*b-2/15 = 0 // + 2/15
-2/5*b = 2/15 // : -2/5
b = 2/15/(-2/5)
b = -1/3
b = -1/3
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