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Mathematics, 06.10.2019 20:30 tinyiaihfurlow

Sorry for all the math questions but i do not understand this at all. someone explain and write the equation for me ? ? they are the exact doesn't make sense to me:

the sum of three times a number (z) and 15 is equal to 21.

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Sorry for all the math questions but i do not understand this at all. someone explain and write the...
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