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5.4x+6.6x=19.2
We move all terms to the left:
5.4x+6.6x-(19.2)=0
We add all the numbers together, and all the variables
12x-19.2=0
We move all terms containing x to the left, all other terms to the right
12x=19.2
x=19.2/12
x=1+6/10
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