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13x+23.9=5x-28.9
We move all terms to the left:
13x+23.9-(5x-28.9)=0
We get rid of parentheses
13x-5x+28.9+23.9=0
We add all the numbers together, and all the variables
8x+52.8=0
We move all terms containing x to the left, all other terms to the right
8x=-52.8
x=-52.8/8
x=-6+1/1.6666666666667
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