I know you're using Khan Academy, anyway the answer is 135 mate.
Answer: a=5
Step-by-step explanation:
3a+2a=5a
5a=25
divide both sides by 5 to get a alone
a=5
Here you go, hope it's right. The top one is the equation and the bottom one is the work to get the answer.
Answer:
13y
Step-by-step explanation:
1y-14y
13y
The sum of 13y