Solve for y, z, t, a, b
y=\frac{5t}{2z}\text{, }z\neq 0\text{, }t\in \mathrm{R}\text{, }a=90\text{, }b=90
y\in \mathrm{R}\text{, }z=0\text{, }t=0\text{, }a=90\text{, }b=90
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