Explanation:
See bring both like terms together like
7a - 5b
-2a + 1b
=? ? ? ?
Now you identify the answer its so easy I all most said the answer there is nothing to solve actually.
Ok
Answer: 5a-4b
=7a+−2a+−5b+b
=(7a+−2a)+(−5b+b)
=5a+(−4b)
=5a-4b
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