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20x-5x=15x-40
We move all terms to the left:
20x-5x-(15x-40)=0
We add all the numbers together, and all the variables
15x-(15x-40)=0
We get rid of parentheses
15x-15x+40=0
We add all the numbers together, and all the variables
40!=0
There is no solution for this equation
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