Algebra
posted by G on .
Solve 2+y/7+5=4+1y/7 for y.
Book says the answer is y=7
How can this be the answer when the y/7 can each other out when you simplify?
7+y/7=5y/7
7____7
___________
y/7=2y/7
This is what I come down to.

they do not cancel each other out, one is positive, the other is negative
add y/7 to both sides
2y/7 = 2
divide by 2 and multiply by 7
y = 7