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b in (-oo:+oo)
-((3/4)*b)-9 = -42/5 // + -42/5
-((3/4)*b)-(-42/5)-9 = 0
(-3/4)*b+42/5-9 = 0
-3/4*b-3/5 = 0 // + 3/5
-3/4*b = 3/5 // : -3/4
b = 3/5/(-3/4)
b = -4/5
b = -4/5
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