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b. 4a+3b-5 + 2a-4b+7 = 4a+2a + 3b+(-4b) + (-5)+7 = 6a-b+2
c. 2(3u-2)+3y + 3(2u+y)+5 = 6u-4+3y + 6u+3y+5 = 12u+6y+1
d. -5u+2y-5 + 4u-3y-8 = -5u+4u + 2y-3y + (-5)-8 = -u-y-13
e. 2a-5b-4e + -3a-yb-3c = 2a-3a + (-5b)-yb + 4e + (-3c) = -a-(5+y)b-3c+4e