Answer: x=-4
Step-by-step explanation:
Distribute the 3 into the parenthesis
3(x+1) = 3x+3
add like terms
3x+3+9= 3x+12
now, it becomes 3x+12=0
Move over the 12 to the other side to calculate x
3x=-12
Divide 3 on both sides
x=-4
3(x+1)+9=0
3x+3+9=0
3x+12=0
3x= -12
x= -12/3
x= -4
