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25x-5x^2=15-5x^2
We move all terms to the left:
25x-5x^2-(15-5x^2)=0
We get rid of parentheses
-5x^2+5x^2+25x-15=0
We add all the numbers together, and all the variables
25x-15=0
We move all terms containing x to the left, all other terms to the right
25x=15
x=15/25
x=3/5
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