Question

-3+4a=21 y comprobación

Answer 1

$\bf \textcolor{blue}{ - 3 + 4a = 21} \\ \\ \bf \textcolor{red}{4a = 21 + 3} \\ \\ \bf \textcolor{blue}{4a = 24} \\ \\ \bf \textcolor{red}{a = \frac{24}{4} } \\ \\ \boxed {a = 6} \\ \\ \\ comprobacion \\ \\ \\ \bf \textcolor{cyan}{ - 3 + 4a = 21} \\ \\ \bf \textcolor{green}{ - 3 + 4(6) = 21} \\ \\ \bf \textcolor{cyan}{ - 3 + 24 = 21} \\ \\ \boxed {21 = 21}$

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