2x²y³z + 3x²y³z = (2 + 3)x²y³z = 5x²y³z
5*(2x²y³z) = 10x²y³z
2x³ + 5a³ - x³ - 3a³ = 2x³ - 1x³ + 5a³ - 3a³ = (2 - 1)x³ + (5 - 3)a³ = 2a³ + x³
25b² + 12b² = (25 + 12)b² = 37b²
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2x²y³z + 3x²y³z = (2 + 3)x²y³z = 5x²y³z
5*(2x²y³z) = 10x²y³z
2x³ + 5a³ - x³ - 3a³ =
2x³ - 1x³ + 5a³ - 3a³ =
(2 - 1)x³ + (5 - 3)a³ =
2a³ + x³
25b² + 12b² =
(25 + 12)b² =
37b²