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2 + 3b - a - 2b =
2 + (3b - 2b) + a =
2 + (b) + a =
2 + b - a
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3a - 2b + a - 3b + 5a
(3a + 5b) + (- 2b - 3b) + a =
8a +( -5b) + a =
8a - 5b + a
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5x - 2xy + 4x - y + 3xy =
(5x + 4x) + ( -2xy + 3xy) -y =
9x + (xy) - y =
9x + xy -y
c=9a+5b
d=9x+5xy