Since 20 is a factor of 40, the least common denominator of 3/20 and 9/40 is 40.
Looks good for high school math make sure the teacher sees you're work clearly and know what the numbers are overall you should be good
Hello!
To solve, we want to isolate the x on one side of the equation. We can use inverse operations to put numbers on the other side to find x.
First we undistribute our parentheses.
12x-66+15=21
We subtract 15 from both sides (it cancels out the 15 on the left side, making it 0).
12x-66=6
Now we add 66 to both sides, as -66+66=0
12x=72
Finally, we divide both sides by 12.
x=6
I hope this helps!
