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40x+(1.5x)10=42000
We move all terms to the left:
40x+(1.5x)10-(42000)=0
We add all the numbers together, and all the variables
40x+(+1.5x)10-42000=0
We multiply parentheses
40x+10x-42000=0
We add all the numbers together, and all the variables
50x-42000=0
We move all terms containing x to the left, all other terms to the right
50x=42000
x=42000/50
x=840
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