just doing homework
(9x - 6) + (- 5x + 7)
Now we open the brackets, then we get
= 9x - 6 - 5x + 7
Now separate the like terms, we get
= 9x - 5x + 7 - 6
= x(9 - 5) + 1
= x(4) + 1
= 4x + 1
Hence (9x - 6) + (- 5x + 7) = 4x + 1
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