Сделайте задание номер 4

Решите задачу:

$f(y)=\frac{3y}{2-\frac{7}{6+2y}}\\\\\left \{ {{6+2y\ne 0} \atop {2-\frac{7}{6+2y}\ne 0}} \right. \; \left \{ {{2y\ne -6} \atop {\frac{12+4y-7}{6+2y}\ne 0}} \right. \; \left \{ {{y\ne -3} \atop {\frac{4y+5}{6+2y}\ne 0}} \right. \; \left \{ {{y\ne -3} \atop {4y+5\ne 0}} \right. \; \left \{ {{y\ne -3} \atop {y\ne -1,25}} \right. \\\\y\in (-\infty ;-3)\cup (-1,25\, ;\, +\infty )$