Answer:
Step-by-step explanation:
because is 11-4, which is 7. And you don't change the x.
13x+9=30
13x=30+9
13x=39
divide both sides by 13
x=3
12x+1=-13
12x=-13-1
12x=-14
divide both sides by 12
x=7/6
x+2+4=11
x+6=11
x=11_6
x=5
30!
Add all sides.