2x + 20 = 3x
20 = 3X - 2X
20 = X
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3x + 2x - 8x + 2x = -x
If you mean 3x + 2x = 100, then x = 20. If you mean something different, you'll need to spell it out.
2x+3x = 5x
2x minus 3x is equal to -x.
3x+5 = 2x+13 3x-2x = 13-5 x = 8