Answer :

[tex]\frac{3(a+b)}{c}=b[/tex]

First, apply distributive property:

[tex]\frac{3(a)\text{ + 3\lparen b\rparen}}{c}=b[/tex][tex]\frac{3a+3b}{c}=b[/tex][tex]3a+3b=bc[/tex][tex]3a\text{ = bc - 3b}[/tex]

Common factor b

[tex]3a=b(c-3)[/tex][tex]a=\frac{b(c-3)}{3}[/tex]

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