Question 641364
7x^2 - {x^2 + 4 - x[x - (7x - 4)]} + 7


7x^2 - {x^2 + 4 - x[x - 7x + 4]} + 7


7x^2 - {x^2 + 4 - x[-6x + 4]} + 7


7x^2 - {x^2 + 4 + 6x^2 - 4x} + 7


7x^2 - {7x^2 - 4x + 4} + 7


7x^2 - 7x^2 + 4x - 4 + 7


4x + 3


So the answer is <font color="red">4x + 3</font>


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