Distribute 2/5 to (y+10)=
After Transpose (leave the numbers only in the rights side, then numbers with letters on the left side)
You might wonder why is the 4 negative. Always remember any number that passes through the = sign becomes opposite.
Multiply the both sides by 5
Cancel 5 and drop y
Divide it both by 2
Cancel 2 and drop y. Leave the negative sign.(on the right)
And that's the FINAL ANSWER