Answer:
[tex] \fbox{ \huge{ \sf{ a = - 8}}}[/tex]
Step-by-step explanation:
[tex] \bigstar{ \sf{ \: 19 = - 3a - 5}}[/tex]
[tex] \tt{Step \: 1 \: }[/tex] : Swap the sides of the equation
[tex] \longmapsto{ \sf{ - 3a - 5 = 19}}[/tex]
[tex] \tt{Step \: 2 \: }[/tex] : Move 5 to right hand side and change it's sign
[tex] \longmapsto{ \sf{ - 3a = 19 + 5}}[/tex]
[tex] \tt{Step \: 3 \: }[/tex] : Add the numbers : 19 and 5
[tex] \longmapsto{ \sf{ - 3a = 24}}[/tex]
[tex] \tt{Step \: 4 \: }[/tex] : Divide both sides by -3
[tex] \longmapsto{ \sf{ \frac{ - 3a}{ - 3} = \frac{24}{ - 3}}} [/tex]
[tex] \tt{Step \: 4}[/tex] : Calculate
[tex] \longmapsto{ \sf{a = - 8}}[/tex]
[tex] \sf ∴ \: the \: value \: of \: a \: is \: - 8.[/tex]
[tex] \sf{Hope \: I \: helped !} [/tex]
[tex] \sf{Best \: regards !!}[/tex]
~[tex] \sf{TheAnimeGirl}[/tex]
