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78+20x=450+20x
We move all terms to the left:
78+20x-(450+20x)=0
We add all the numbers together, and all the variables
20x-(20x+450)+78=0
We get rid of parentheses
20x-20x-450+78=0
We add all the numbers together, and all the variables
-372!=0
There is no solution for this equation
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