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11.5x+x=72
We move all terms to the left:
11.5x+x-(72)=0
We add all the numbers together, and all the variables
12.5x-72=0
We move all terms containing x to the left, all other terms to the right
12.5x=72
x=72/12.5
x=5+2.7142857142857/3.5714285714286
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