Well, isn't that a happy little math problem we have here? To solve 3x + 5y, you just need to combine like terms. You can't add x and y together, so the expression stays as 3x + 5y. Just remember, there are no mistakes in math, only happy little accidents!
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3x/7 + 5y/14x = 3x*2x/(7*2x) + 5y/14x = (6x2 + 5y)/14x
(6x - 5y) + (-3x - 4y) =6x - 5y - 3x - 4y =3x - 9y =3 (x - 3y)
3x - 8y + 2x - 5 - 5y = 5x -13y - 5
X = -2(13 + y) / 3x = 5y / 4 - 1
-3x = 3 + y 3 + y - 5y = -21 -4y = -24 y = 6 x = -3