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13x=100-7x
We move all terms to the left:
13x-(100-7x)=0
We add all the numbers together, and all the variables
13x-(-7x+100)=0
We get rid of parentheses
13x+7x-100=0
We add all the numbers together, and all the variables
20x-100=0
We move all terms containing x to the left, all other terms to the right
20x=100
x=100/20
x=5
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