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10x+15x=8.20
We move all terms to the left:
10x+15x-(8.20)=0
We add all the numbers together, and all the variables
10x+15x-(8.2)=0
We add all the numbers together, and all the variables
25x-8.2=0
We move all terms containing x to the left, all other terms to the right
25x=8.2
x=8.2/25
x=6.83333333333/20.8333333333
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