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42x+2400+1600=45x-3x+4000
We move all terms to the left:
42x+2400+1600-(45x-3x+4000)=0
We add all the numbers together, and all the variables
42x-(42x+4000)+2400+1600=0
We add all the numbers together, and all the variables
42x-(42x+4000)+4000=0
We get rid of parentheses
42x-42x-4000+4000=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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