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0.7=x+0.4
We move all terms to the left:
0.7-(x+0.4)=0
We get rid of parentheses
-x-0.4+0.7=0
We add all the numbers together, and all the variables
-1x+0.3=0
We move all terms containing x to the left, all other terms to the right
-x=-0.3
x=-0.3/-1
x=0.3/1
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