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40x+(1.5)10x=42000
We move all terms to the left:
40x+(1.5)10x-(42000)=0
We multiply parentheses
40x+15x-42000=0
We add all the numbers together, and all the variables
55x-42000=0
We move all terms containing x to the left, all other terms to the right
55x=42000
x=42000/55
x=763+7/11
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