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4z - 1 = 9

4z = 10 (add 1 to both sides)

z = 2.5 (divide both sides by 4)

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Q: If 4z-1 equals 9 what is z?
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What is the x- value of x-2y plus z equals -9 3y-2z equals 4 2x plus y plus 5z equals -5?

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