z??
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Inverse operations again. Undo the -7 on both sides by adding 7 to both sides. Leaves you with 2z=38. Undo the multiplied by 2 by dividing by 2. That leaves you with z=19
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Add 7 to both sides, divide by 2. Z is 19
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2z-7=31
2z=38
z=19
2z=38
z=19
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Z=19
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Z=19