Simplify powers of y: First, simplify the powers of y since y0=1.−4x4⋅1⋅z2−zx4⋅1=−4x4z2−zx4
Cancel out common terms: Next, simplify the expression by canceling out common terms. The x4 terms cancel out and one z in the numerator and denominator cancels out. 4z−z=−41
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