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12x-40=102.2
We move all terms to the left:
12x-40-(102.2)=0
We add all the numbers together, and all the variables
12x-142.2=0
We move all terms containing x to the left, all other terms to the right
12x=142.2
x=142.2/12
x=11+4.6363636363637/5.4545454545455
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