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0.6x+2.8=0.4
We move all terms to the left:
0.6x+2.8-(0.4)=0
We add all the numbers together, and all the variables
0.6x+2.4=0
We move all terms containing x to the left, all other terms to the right
0.6x=-2.4
x=-2.4/0.6
x=-4
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