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0.1x+3/10=4/10
We move all terms to the left:
0.1x+3/10-(4/10)=0
We add all the numbers together, and all the variables
0.1x+3/10-(+4/10)=0
We get rid of parentheses
0.1x+3/10-4/10=0
We multiply all the terms by the denominator
(0.1x)*10+3-4=0
We add all the numbers together, and all the variables
(+0.1x)*10+3-4=0
We add all the numbers together, and all the variables
(+0.1x)*10-1=0
We multiply parentheses
0x-1=0
We add all the numbers together, and all the variables
x-1=0
We move all terms containing x to the left, all other terms to the right
x=1
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