Solve the following equation by trial and error method.

$3z=18.$

Solve the following equation by trial and error method.

$x+\frac{5}{2}=10.$

Solve the following equation by trial and error method.

$2y-6=10.$

Solve the following equation by the systematic method.

$2x+7=15$.

Solve the following equation by the systematic method.

$2y-30=0$.

Solve the following equation by the systematic method.

$5y-5=35$.

Solve the following equation by the systematic method.

$5y+\frac{5}{8}=10$.