6c2-2c-1-4c2+7c+5

Subtract 4c2 from 6c2.

2c2-2c-1+7c+5

Add -2c and 7c.

2c2+5c-1+5

Add -1 and 5.

2c2+5c+4

Add 6c^2-2c-1-4c^2+7c+5

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# Add 6c^2-2c-1-4c^2+7c+5

6c2-2c-1-4c2+7c+5

Subtract 4c2 from 6c2.

2c2-2c-1+7c+5

Add -2c and 7c.

2c2+5c-1+5

Add -1 and 5.

2c2+5c+4

Add 6c^2-2c-1-4c^2+7c+5