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-3x=7.8
We move all terms to the left:
-3x-(7.8)=0
We add all the numbers together, and all the variables
-3x-7.8=0
We move all terms containing x to the left, all other terms to the right
-3x=7.8
x=7.8/-3
x=-2+1/1.6666666666667
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