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0.2(4)+0.2(4)+0.4(x)=5.5
We move all terms to the left:
0.2(4)+0.2(4)+0.4(x)-(5.5)=0
We add all the numbers together, and all the variables
0.4x-5.02=0
We move all terms containing x to the left, all other terms to the right
0.4x=5.02
x=5.02/0.4
x=12+0.22/0.4
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