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-0.7x+0.4x-6=-3
We move all terms to the left:
-0.7x+0.4x-6-(-3)=0
We add all the numbers together, and all the variables
-0.3x-3=0
We move all terms containing x to the left, all other terms to the right
-0.3x=3
x=3/-0.3
x=-10
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