Hey there!
5 + 14a = 9a - 5
WORKING OUT the LEFT SIDE
5 + 14a
= 5 + 14(-2)
= 5 - 28
= -23
WORKING OUT the RIGHT SIDE
9a - 5
= 9(-2) - 5
= -18 - 5
= -23
SOLVING FOR the OVERALL ANSWER
-23 = -23
This makes your statement [true]. Because, both sets of equations are equivalent to each other, just substitute “-2” for your ‘a-value’ in your given equation to make it easier to solve or tackle the problem down.
Good luck on your assignment & enjoy your day!
~Amphitrite1040:)