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1=0.1x-0.9x-15
We move all terms to the left:
1-(0.1x-0.9x-15)=0
We add all the numbers together, and all the variables
-(-0.8x-15)+1=0
We get rid of parentheses
0.8x+15+1=0
We add all the numbers together, and all the variables
0.8x+16=0
We move all terms containing x to the left, all other terms to the right
0.8x=-16
x=-16/0.8
x=-20
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