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Anonymous
Combine the ' 9r ' and the ' -5r ' . Replace them with ' 4r '.
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5k + 7 + 3k can be simplified into 8k + 7
When you simplify 49 plus 37 (49+37), the result is 86.
30m-7
3x + 8
7(a + 3) = 7*a + 7*3 = 7a + 21