When they have the same variable.
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12t + 15
3k + 1
To simplify the expression (3c - 7 + 2c - 5), first combine like terms. The (c) terms (3c) and (2c) add up to (5c), while the constant terms (-7) and (-5) combine to (-12). Therefore, the simplified expression is (5c - 12).
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.