Question 83449
2y+7+4=y

==> 2y + 11 = y

adding -y to both the sides,

2y + 11 - y = 0

adding -11 to both the sides.

y + 11 -11 = -11

=> y = -11

Check:

2y+7+4=y
Replacing y by -11,
2(-11) + 11 = -11

==> -22 + 11 = -11

==> -11 = -11

Hence the solution of y = -11 is correct.