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0.4x+2.4=-4
We move all terms to the left:
0.4x+2.4-(-4)=0
We add all the numbers together, and all the variables
0.4x+6.4=0
We move all terms containing x to the left, all other terms to the right
0.4x=-6.4
x=-6.4/0.4
x=-16
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