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b in (-oo:+oo)
(-1/2)*b = 7/10-(9/4) // - 7/10-(9/4)
(-1/2)*b-(7/10)+9/4 = 0
(-1/2)*b-7/10+9/4 = 0
31/20-1/2*b = 0 // - 31/20
-1/2*b = -31/20 // : -1/2
b = -31/20/(-1/2)
b = 31/10
b = 31/10
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