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0.4x+0.3=0.8x-1.7
We move all terms to the left:
0.4x+0.3-(0.8x-1.7)=0
We get rid of parentheses
0.4x-0.8x+1.7+0.3=0
We add all the numbers together, and all the variables
-0.4x+2=0
We move all terms containing x to the left, all other terms to the right
-0.4x=-2
x=-2/-0.4
x=+5
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