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Given:
A number increased by four and then doubled is the same as 28 decreased by three times the number.
To find:
The unknown number.
Solution:
Let the unknown number be x.
The number increased by four = x+4
And then doubled = 2(x + 4)
Three times the number = 3x
28 decreased by three times the number = 28 - 3x
Now,
Isolate variable terms.
Divide both sides by 5.
Therefore, the value of unknown number is 4.