Two solutions: One with math, one with common sense. 1). 5 + x = 2x. Subtract x from both sides of the equation: 5 = x2). If adding 5 to something made it double, what do you think it was before you added the 5 ?
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2x+2=x+5 x=3
If your question was 2X + 5 =10. X equals what? Then X=2.5
X should be zeroas:X + 5 = 2X + 5so, 2X - X = 0 or X = 0
X=27
x + 2x + 5 = x +19 3x + 5 = x +19 3x - x = 19 - 5 2x = 14 x = 7