Answer:
B, 270
Step-by-step explanation:
I'm not 100% sure if I'm correct cause I could have made an error but I had gotten 12% as the answer
the number is 12
3x+9=5x-15
9+15=5x-3x
24=2x
12=x
So for this, multiply both sides by 9, and your answer will be:
x²+2x-3=0
(x²+3x)-(x-3)=0
x(x+3)-1(x+3)=0
(x-1)(x+3)=0
x=1 or x=-3
