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