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10x+3x=8.75
We move all terms to the left:
10x+3x-(8.75)=0
We add all the numbers together, and all the variables
13x-8.75=0
We move all terms containing x to the left, all other terms to the right
13x=8.75
x=8.75/13
x=5/7.4285714285714
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