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6x+12.6+1.2x=-9
We move all terms to the left:
6x+12.6+1.2x-(-9)=0
We add all the numbers together, and all the variables
7.2x+21.6=0
We move all terms containing x to the left, all other terms to the right
7.2x=-21.6
x=-21.6/7.2
x=-3
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