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alexandr402 [8]
3 years ago
15

What is the variable equal in the equation ten less than 3 times a number is the same as the number plus 4?

Mathematics
2 answers:
klio [65]3 years ago
7 0

The variable is "the number".  To make it easier to write the equation
and work with it, let's call the variable 'M' for '<em>M</em>ystery number'.

3 times the number is 3M .

-- 10 less than that is  <u>3M-10</u> .
-- the number plus 4 is  <u>M+4</u> . 

The question says that these two things are the same.
So ...
                                              <u>3M - 10  =  M + 4</u>

Subtract 'M' from each side:    2M - 10 = 4

Add  10 to  each side:              2M      = 14

Divide each side by 2 :              <em>M  =  7 </em>


Oksanka [162]3 years ago
6 0
x-\ number\\\\&#10;3x-10=x+4\ \ \ | subtract\ x\\\\&#10;2x-10=4\ \ \ | add\ 10\\\\&#10;2x=14\ \ \ | divide\ by\ 2\\\\&#10;x=7\\\\&#10;Number\ is \ 7.
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