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5(20x+50)=850
We move all terms to the left:
5(20x+50)-(850)=0
We multiply parentheses
100x+250-850=0
We add all the numbers together, and all the variables
100x-600=0
We move all terms containing x to the left, all other terms to the right
100x=600
x=600/100
x=6
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