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I don't know how to do this (answer pls ) number 3

I don't know how to do this (answer pls ) number 3-example-1
User Madmadi
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For problem number b = 3
User Shnraj
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Subtract 2b by both sides which gets -b+4=-5 then subtract 4 by both sides so you get -b=-9 and divide -1 by both sides so that b=9
User Ben Davison
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