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Pls help I'm litterslly abt to cry

Pls help I'm litterslly abt to cry-example-1

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Answer:

a=16.5 b=-18

Explanation:

21 ? -12

make the 12 into zero which is just minus 12 balance it out by adding 12 onto 21= 33 33/2 = 16.5
a = 16.5

-1 to 0 minus 3 so the b variable will be -18

b=-18

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