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\(7.2+2.4b=-12\)

 

Subtract 7.2 from both sides

 

\(2.4b=-19.2\)

 

Divide 2.4 from both sides

 

\(b=-8\)

 

Check your answer.  Subsitute -8 for b

 

\(7.2+2.4*-8=-12\)

 

Mltiply 2.4 and -8

 

\(7.2+(-19.2)=-12\)

 

Distribubute the addition sign

 

\(7.2-19.2=-12\)

 

Subtract 19.2 from 7.2

 

\(-12=-12\)

 

Check