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(1.78x)^2+x^2=3025
We move all terms to the left:
(1.78x)^2+x^2-(3025)=0
We add all the numbers together, and all the variables
x^2+(+1.78x)^2-3025=0
We move all terms containing x to the left, all other terms to the right
x^2+(+1.78x)^2=3025
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