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= 4x+3x+9x+5-4-3
=16x-2
b) (4x + 5) - (3x - 4) - (9x - 3) =?
= 4x-3x-9x+5+4+3
= -8x+12
c) 9a-a²-6a-(-a²)=?
= -a²+a²+9a-6a
= 0+3a
= 3a
d) 3ab - 9 + (-7ba) - a=?
= 3ab-7ab-9-a
= -4ab-a-9
e) -3ab + 5bc - (-2bc) - ab=?
= -3ab-ab+5bc+2bc
= -4ab+7bc
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