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Q: A number plus twice the number is equal to three times the number?

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2x+x=3x

n + 2n = 3n

twice the difference of three times a number and eight

2x - 16 = 3x/18

It is: 3x = 2x+8 and the value of x is 8

3

three times a number decreased by eleven

let the number be n. Then: 2n = 3n ⇒ 2n - 2n = 3n - 2n ⇒ 0 = n ie, the number is zero.

There are two possible (and different) answers: 2x + 3y = 12 or 2*(x + 3y)= 12 The first one is (twice a number) increased by (three times another) The second is twice (a number increased by (three times another)).

One.

18

2*(x + 21) = 3*abs(x - 5) => x = -5.4 or x = 57.

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