2/3y+4=12

could you mean:

(2/3)y + 4 = 12
or
2/(3y) + 4 = 12
or
2/(3y+4) = 12
or
2/[3(y+4)] = 12
?
without parentheses I do not have any idea.

however, given the usual sloppiness online, I suspect we have

2/3 y + 4 = 12
2/3 y = 8
y = 3/2 * 8
y = 12

To solve the equation 2/3y + 4 = 12, we can follow these steps:

Step 1: Start by subtracting 4 from both sides of the equation:
2/3y + 4 - 4 = 12 - 4
This simplifies to:
2/3y = 8

Step 2: Next, we need to isolate the variable y. Since y is being multiplied by 2/3, we can multiply both sides of the equation by the reciprocal of 2/3, which is 3/2:
(2/3y) * (3/2) = 8 * (3/2)

On the left side, the 2/3 and 3/2 will cancel out:
y = 8 * (3/2)

Step 3: Multiply the numbers:
y = 24/2

Finally, simplify the fraction:
y = 12

Therefore, the solution to the equation 2/3y + 4 = 12 is y = 12.