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-4(0.1x+0.2)-0.9=-0.1
We move all terms to the left:
-4(0.1x+0.2)-0.9-(-0.1)=0
We add all the numbers together, and all the variables
-4(0.1x+0.2)-0.8=0
We multiply parentheses
-0x-0.8-0.8=0
We add all the numbers together, and all the variables
-1x-1.6=0
We move all terms containing x to the left, all other terms to the right
-x=1.6
x=1.6/-1
x=-1+0.6/1
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