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(1-x)(2-x)=(2x)^2/(49.7)
We move all terms to the left:
(1-x)(2-x)-((2x)^2/(49.7))=0
We add all the numbers together, and all the variables
(-1x+1)(-1x+2)-(2x^2/(49.7))=0
We multiply parentheses ..
(+x^2-2x-1x+2)-(2x^2/(49.7))=0
We multiply all the terms by the denominator
((+x^2-2x-1x+2))*(49.7))-(2x^2=0
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