Answer:
use khan academy
Step-by-step explanation:
khanacedemy.com
dont cheat dude
3y-20+x+13=3x+9
3y-20+x+13+2y=180
3y-7+x=3x+9
3y=2x+16
y=2/3x+16/3
5y+x=187
5(2/3x+16/3)+x=187
10/3x+80/3+x=187
13/3x=481/3
x=37
Take online tests on what you think you need work on
And also study