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0.9x=9-0.8x
We move all terms to the left:
0.9x-(9-0.8x)=0
We add all the numbers together, and all the variables
0.9x-(-0.8x+9)=0
We get rid of parentheses
0.9x+0.8x-9=0
We add all the numbers together, and all the variables
1.7x-9=0
We move all terms containing x to the left, all other terms to the right
1.7x=9
x=9/1.7
x=5+0.5/1.7
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