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b in (-oo:+oo)
105/5 = 3*(4-(2*b)) // - 3*(4-(2*b))
105/5-(3*(4-(2*b))) = 0
105/5-3*(4-2*b) = 0
21-3*(4-2*b) = 0
21-3*(4-2*b) = 0
6*b+9 = 0
6*b+9 = 0
6*b+9 = 0 // - 9
6*b = -9 // : 6
b = -9/6
b = -3/2
b = -3/2
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