5a-5=7+2a -- we need to isolate a. Subtract 2a from both sides
3a-5=7 -- add 5 to both sides
3a=12 -- divide by 3
a=4
The correct answer is the second option :)
Answer:
Too tired to explain, here's some digital steps by Symbolab:
From the cars parked in the lot he will earn (40)($10)=$400, but he will need to pay $50 for the rent. Thus his total $ earned will be $400-$50=$350.