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13x-7.1+5x=18.7
We move all terms to the left:
13x-7.1+5x-(18.7)=0
We add all the numbers together, and all the variables
18x-25.8=0
We move all terms containing x to the left, all other terms to the right
18x=25.8
x=25.8/18
x=1+4.3333333333333/10
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