Identify the errors and correct them
1) 7y²-y²+3y² = 10y²
2) 6xy+3xy = 9x²y²
3) -3p²+4p-7 = -(3p²+4p-7)
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In the first one the answer should be 9y²
In the second one the answer should be 9xy not 9x²y²
And in the third one it is incorrect as - 3p²+4p-7 is not equal to - (3p²+4p-7) Both we will get different answers
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