[tex] \huge \bf\pink \mapsto\boxed{ \bf\red{A = \frac{- 5C +T }{BC} \\ }}[/tex]
[tex]\bf\longrightarrow{T = C(5 + AB)}[/tex]
[tex]\bf\longrightarrow{ABC + 5C = T}[/tex]
[tex]\bf\longrightarrow{ABC + 5C - 5C= T + - 5C }\\ \\ \bf\longrightarrow{ABC = - 5C + T}[/tex]
[tex]\bf\longrightarrow{ \frac{ABC}{BC} = \frac{- 5C+ T}{BC}} \\ \\ \bf\longrightarrow \boxed{{ \bf \red {A = \frac{- 5C+ T}{BC}}}} \: \: \underline{ \pink{ans.}}[/tex]