Solve for x, y, z, w
x = \frac{7}{2} = 3\frac{1}{2} = 3.5
y = -\frac{15}{4} = -3\frac{3}{4} = -3.75
z = \frac{17}{4} = 4\frac{1}{4} = 4.25
w = \frac{13}{2} = 6\frac{1}{2} = 6.5
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