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8 December, 04:49

Solve the inequality 21 - z < 19

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  1. 8 December, 06:26
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    You need to isolate z, so first subtract 21 from both sides so you have:

    -z<-2

    Multiply both sides by - 1 so z is positive (when a negative number is multiplied or divided in an inequality, the sign flips):

    z>2
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