Variable $y$ cannot be equal to $17$ since division by zero is not defined. Multiply both sides of the equation by $56\left(y-17\right)$, the least common multiple of $17-y,56$.
$$-56\times 25=\left(y-17\right)\times 200$$
Multiply $-56$ and $25$ to get $-1400$.
$$-1400=\left(y-17\right)\times 200$$
Use the distributive property to multiply $y-17$ by $200$.
$$-1400=200y-3400$$
Swap sides so that all variable terms are on the left hand side.
