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Explain the errors made in each of the following situations. Be sure to show the necessary corrections in your response.

a) 3 ( x+7 ) = 3x + 7
b) 4y + 2w = 6yw
c) 8a - 3a = 5
d) ( 6y + 3 ) - ( 2y - 1 ) = 4y + 2