Solve for x, c, y, z, a, b, d
x=2\text{, }y=5\text{, }z=5\text{, }c=\frac{13}{2}=6.5\text{, }a=5\text{, }b=5\text{, }d=5
x=-5\text{, }y=5\text{, }z=5\text{, }c=\frac{13}{2}=6.5\text{, }a=5\text{, }b=5\text{, }d=5
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