Answer:
[tex]3a-1[/tex]
Solution:
[tex]\bold{(7a-6b+3) + (-4a+6b-4)}\\\\=(7a-6b+3) + (-4a+6b-4)\\\\=7a-6b+3 + (-4a)+6b-4\\\\= 7a-4a-6b+6b+3-4\\\\=(7a-4a)+[(-6b)+6b]+[3+(-4)]\\\\=3a -1\\\\\boxed{=3a-1}[/tex]
(Take Note: Only like terms can be neither added nor subtracted)
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