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13x-28=3x+7
We move all terms to the left:
13x-28-(3x+7)=0
We get rid of parentheses
13x-3x-7-28=0
We add all the numbers together, and all the variables
10x-35=0
We move all terms containing x to the left, all other terms to the right
10x=35
x=35/10
x=3+1/2
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