17b-5(a+3b)
9a+7b
4x-8y
-5a+2b
7(x+2y)
15a+9b-6a-2b
10a-15b
10a+14b
3x+6y-x-4y
3(6a-5b)-8a
12x+20y
2(5a+7b)
6a-18b
6x+7y
4(3x+5y)
6(a-3b)
20x-4(2y+4x)
7x+14y
7a+12b
8x+2y-2x+5y
4a+5b+3a+7b
2x+2y
