(7-b)+(3b+2)

Remove parentheses.

7-b+3b+2

Add 7 and 2.

-b+3b+9

Add -b and 3b.

2b+9

Add (7-b)+(3b+2)

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# Add (7-b)+(3b+2)

(7-b)+(3b+2)

Remove parentheses.

7-b+3b+2

Add 7 and 2.

-b+3b+9

Add -b and 3b.

2b+9

Add (7-b)+(3b+2)