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7x-2.7=-6x-7.8
We move all terms to the left:
7x-2.7-(-6x-7.8)=0
We get rid of parentheses
7x+6x+7.8-2.7=0
We add all the numbers together, and all the variables
13x+5.1=0
We move all terms containing x to the left, all other terms to the right
13x=-5.1
x=-5.1/13
x=-4.6363636363636/11.818181818182
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