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.1+2(0.4x+1)=12
We move all terms to the left:
.1+2(0.4x+1)-(12)=0
We add all the numbers together, and all the variables
2(0.4x+1)-11.9=0
We multiply parentheses
0x+2-11.9=0
We add all the numbers together, and all the variables
x-9.9=0
We move all terms containing x to the left, all other terms to the right
x=9.9
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