Question 519584
4x(x-8)-5x(x-7)=-4
4x^2-32x-5x^2+35x=-4
-x^2-32x+35x=-4
-x^2+3x=-4
-x^2+3x+4=0
x^2-3x-4=0
(x-4)(x+1) =  0
x = {-1, 5}
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So, yes, you're right!