2x + - 2x = 0 (zero)
Remember when you have two opposite signs, treat it as negative (-).
Also the 'x' is an unknown but fixed amount, so the 'x' in '2x' could be '3', so the 'x' in '-2x' is ALSO '3'.
Hence
2(3) + - 2(3) =
6 - 6 = 0
NB
For mixed signs#
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