a) (9-3a)+2a-(6-2a)
= 9-3a+2a-6+2a= 3+a
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b) 7-8(-2x+1\2)-13x-6
=7+16x-4-13x-6 = -3+3x
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a) (9-3a)+2a-(6-2a)
= 9-3a+2a-6+2a= 3+a
--------------------------------------
b) 7-8(-2x+1\2)-13x-6
=7+16x-4-13x-6 = -3+3x