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2(150+.15x)=500
We move all terms to the left:
2(150+.15x)-(500)=0
We add all the numbers together, and all the variables
2(.15x+150)-500=0
We multiply parentheses
2x+300-500=0
We add all the numbers together, and all the variables
2x-200=0
We move all terms containing x to the left, all other terms to the right
2x=200
x=200/2
x=100
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