When they have the same variable.
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12t + 15
3k + 1
6
To simplify the expression 8x - 8 - 4x - 3 - 3x, first combine like terms. Start by combining the x terms: 8x - 4x - 3x = x. Then, combine the constant terms: -8 - 3 = -11. Therefore, the simplified expression is x - 11.
To simplify the expression (10n - 4n), you combine the like terms. Subtract (4n) from (10n) to get (6n). Therefore, the simplified expression is (6n).