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12.6x-3.6x=142.4
We move all terms to the left:
12.6x-3.6x-(142.4)=0
We add all the numbers together, and all the variables
9x-142.4=0
We move all terms containing x to the left, all other terms to the right
9x=142.4
x=142.4/9
x=15+5.2857142857143/6.4285714285714
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