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(x-4)(7-x)=5-x*x
We move all terms to the left:
(x-4)(7-x)-(5-x*x)=0
We add all the numbers together, and all the variables
(x-4)(-1x+7)-(-x*x+5)=0
We get rid of parentheses
(x-4)(-1x+7)+x*x-5=0
We multiply parentheses ..
(-1x^2+7x+4x-28)+x*x-5=0
Wy multiply elements
(-1x^2+7x+4x-28)+x^2-5=0
We get rid of parentheses
-1x^2+x^2+7x+4x-28-5=0
We add all the numbers together, and all the variables
11x-33=0
We move all terms containing x to the left, all other terms to the right
11x=33
x=33/11
x=3
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