Question 803467
a(a − x) + 4b(x − 4b) = 0.
This is my solution am i on the right track:
a^2-ax+4bx-16b^2=0  (right)

(4b-a)x = 16b^2-a^2


(4b-a)x = (4b-a)(4b+a)  ,  since a is not equal to 4b  (4b-a is not 0)

x =  4b+a

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