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6.4+2.1(z-2)=8.5

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6.4+2.1(z-2)=8.5
6.4+(2.1•z)-(2.1•-2)=8.5
6.4+2.1z-4.2=8.5
2.1z+6.3=8.5
2.1z=-2.1
Z=3

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