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5(20x+100)=1200
We move all terms to the left:
5(20x+100)-(1200)=0
We multiply parentheses
100x+500-1200=0
We add all the numbers together, and all the variables
100x-700=0
We move all terms containing x to the left, all other terms to the right
100x=700
x=700/100
x=7
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