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750x+500(16-x)=120
We move all terms to the left:
750x+500(16-x)-(120)=0
We add all the numbers together, and all the variables
750x+500(-1x+16)-120=0
We multiply parentheses
750x-500x+8000-120=0
We add all the numbers together, and all the variables
250x+7880=0
We move all terms containing x to the left, all other terms to the right
250x=-7880
x=-7880/250
x=-31+13/25
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