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100(x+5)=450-50x
We move all terms to the left:
100(x+5)-(450-50x)=0
We add all the numbers together, and all the variables
100(x+5)-(-50x+450)=0
We multiply parentheses
100x-(-50x+450)+500=0
We get rid of parentheses
100x+50x-450+500=0
We add all the numbers together, and all the variables
150x+50=0
We move all terms containing x to the left, all other terms to the right
150x=-50
x=-50/150
x=-1/3
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