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Mathematics 10 Online
OpenStudy (anonymous):

x-2/7=3 HELP!

OpenStudy (andrewishere):

\[x-2\div7=3\]

OpenStudy (andrewishere):

Since this problem uses division, we will actually multiply to find our answer

OpenStudy (andrewishere):

We know the answer must equal 3 and that something divided by 7 must equal 3. So what is 7*3?

OpenStudy (andrewishere):

Do you know?

OpenStudy (anonymous):

its 21

OpenStudy (anonymous):

7 x 3=21

OpenStudy (andrewishere):

Good. So 21/3 = 7. This is a correct statement. But there is more. We have to add 2 as the problem states that x (which we have determined is 21) must have 2 subtracted from it, THEN it is divided by 7. So we do the opposite of subtraction, which is addition. So 21 + 2 =

OpenStudy (anonymous):

23

OpenStudy (andrewishere):

Perfect. So lets check. Plug in 23 for x: (23)-2/7 = 3 21/7 = 3 3 = 3

OpenStudy (anonymous):

so whats the answer?

OpenStudy (andrewishere):

So x=23

OpenStudy (andrewishere):

Did this help you?

OpenStudy (anonymous):

sorta but its not listed as one of my options

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