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0.10(x+10)-0.90(x+2)=0
We multiply parentheses
0.1x-0.9x+1-1.8=0
We add all the numbers together, and all the variables
-0.8x-0.8=0
We move all terms containing x to the left, all other terms to the right
-0.8x=0.8
x=0.8/-0.8
x=-1
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