Question

2y + 21 - 6y = -12 + y - 7

Answer 1

$\large\boxed{\begin{array}{l}\sf 2y+21-6y=-12+y-8\\\sf 2y-6y-y=-12-8-21\\\sf -5y=-41\cdot(-1)\\\sf 5y=41\\\\\huge\boxed{\boxed{\boxed{\boxed{\sf y=\dfrac{41}{5}}}}}\end{array}}$