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1=0.4x-0.5x-4
We move all terms to the left:
1-(0.4x-0.5x-4)=0
We add all the numbers together, and all the variables
-(-0.1x-4)+1=0
We get rid of parentheses
0.1x+4+1=0
We add all the numbers together, and all the variables
0.1x+5=0
We move all terms containing x to the left, all other terms to the right
0.1x=-5
x=-5/0.1
x=-50
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