simply each expression by combining like terms.
(3) 4s+8+2d+3s+
(4) 7b+8n-4b-8+n
(5) 15ab-6a+7b-2b
(6) ×+4×+×+4y
(3) 4s+8+2d+3s+
(4) 7b+8n-4b-8+n
(5) 15ab-6a+7b-2b
(6) ×+4×+×+4y