150•y+350=5600:7

To solve the equation \( 150y + 350 = \frac{5600}{7} \), let's first simplify the right side of the equation.

Calculating \( \frac{5600}{7} \):

\[ \frac{5600}{7} = 800 \]

Now, substitute this back into the equation:

\[ 150y + 350 = 800 \]

Next, isolate \( y \) by subtracting 350 from both sides:

\[ 150y = 800 - 350 \]

\[ 150y = 450 \]

Now, divide both sides by 150:

\[ y = \frac{450}{150} \]

\[ y = 3 \]

So, the solution is \( y = 3 \).