If you mean 3x + 2x = 100, then x = 20.
If you mean something different, you'll need to spell it out.
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3x + 2x - 8x + 2x = -x
2x+3x = 5x
This question is incomplete. 2x2 + 3x - 100 can not be solved unless you tell us what it is equal to.
3x+5 = 2x+13 3x-2x = 13-5 x = 8
3x + 5x = 2x + 28x = 2x + 26x = 2x = (2/6) = 1/3