Question

three times a number increased by 21 and the product of 9 and a number decreased by 7 ​

Answer 1

Step-by-step explanation:

according to the first statement

let a number be x

so, x + 21

according to the second statement

9*x+7= 9x -7

let's form a equation:

x+21=9x-7

x-9x=-7-21

-10x = -28

x=-28/-10

x=2.8

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