I'm having difficulty solving 0.7y+9=y+15?????

I know the answer is 20 but can't remember procedure.
Do I change the decimal to a fraction 1st???

getting rid of decimals and fractions is usually a good first step. In this case, we get

7y + 90 = 10y + 150
-3y = 60
y = -20

it could have been done without that. the procedure is to collect all the y's on one side, and the numbers on the other

.7y - y = 15 - 9
-.3y = 6
y = 6/-.3
y = -20

To solve the equation 0.7y + 9 = y + 15, you don't need to change the decimal to a fraction first. Here's the procedure:

1. Start by combining like terms. Move the 'y' term to one side of the equation and the constant terms to the other side.
0.7y - y = 15 - 9

Simplifying this, we have:
-0.3y = 6

2. To eliminate the decimal, you can multiply both sides of the equation by 10. This eliminates the decimal point by shifting each digit one place to the left.
-0.3y * 10 = 6 * 10

Simplifying further, we get:
-3y = 60

3. Divide both sides of the equation by -3 to isolate 'y'.
-3y / -3 = 60 / -3

This simplifies to:
y = -20

Therefore, the solution to the equation 0.7y + 9 = y + 15 is y = -20, not 20 as you mentioned before. Double-check your work, as you might have made a mistake along the way.