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0=0.4+0.8x
We move all terms to the left:
0-(0.4+0.8x)=0
We add all the numbers together, and all the variables
-(0.8x+0.4)+0=0
We add all the numbers together, and all the variables
-(0.8x+0.4)=0
We get rid of parentheses
-0.8x-0.4=0
We move all terms containing x to the left, all other terms to the right
-0.8x=0.4
x=0.4/-0.8
x=-0.4/0.8
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