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0.4x-7=0.5x+5
We move all terms to the left:
0.4x-7-(0.5x+5)=0
We get rid of parentheses
0.4x-0.5x-5-7=0
We add all the numbers together, and all the variables
-0.1x-12=0
We move all terms containing x to the left, all other terms to the right
-0.1x=12
x=12/-0.1
x=-120
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