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1.9=0.7*1.9+0.2*1.7+0.1x
We move all terms to the left:
1.9-(0.7*1.9+0.2*1.7+0.1x)=0
We add all the numbers together, and all the variables
-(0.1x+1.67)+1.9=0
We get rid of parentheses
-0.1x-1.67+1.9=0
We add all the numbers together, and all the variables
-0.1x+0.23=0
We move all terms containing x to the left, all other terms to the right
-0.1x=-0.23
x=-0.23/-0.1
x=2+0.03/0.1
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