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Some one plz tell me how to do this

Some one plz tell me how to do this-example-1
User Jodonnell
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2 Answers

7 votes
you subtract 18-5y which leaves 13 which is what your y is
User Dutch Glory
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3 votes
subtract the 18 from the 78 then multiply both sides by -1, then divide by 5.
User Teran
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