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0.4(x)=1.6
We move all terms to the left:
0.4(x)-(1.6)=0
We add all the numbers together, and all the variables
0.4x-1.6=0
We move all terms containing x to the left, all other terms to the right
0.4x=1.6
x=1.6/0.4
x=4
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