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Verified Answer :

So, you do inverse operations on both sides:
14.4 = -2.4b
Divide both sides by -2.4
14.4/-2.4 = -2.4b/-2.4 gets you
-6 = b

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Parton

Well it's very easy you just have to use a reverse calculation:
14.4=-2.4×b⇒b=14.4÷(-2.4)⇒b=-6