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1=0.4x-0.5x-3
We move all terms to the left:
1-(0.4x-0.5x-3)=0
We add all the numbers together, and all the variables
-(-0.1x-3)+1=0
We get rid of parentheses
0.1x+3+1=0
We add all the numbers together, and all the variables
0.1x+4=0
We move all terms containing x to the left, all other terms to the right
0.1x=-4
x=-4/0.1
x=-40
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