can someone pls solve these for me i’ll give brainlist

Answer:3) a=14 4( x=4 5) a=8
Step-by-step explanation:
3)QUESTION: 4+a=18
first you -4 from both sides to get rid of the 4 to put a on its own so now it is
a=14
ANSWER: a=14
4)QUESTION: 7x=28
you divide 7 by both sides to make 7 x to x
x=4
ANSWER: x=4
5) QUESTION:a+5=13
you minus 5 from both sides to put a on its own.
a=8
ANSWER= a=8