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0.2x+0.9=0.9x-5.4
We move all terms to the left:
0.2x+0.9-(0.9x-5.4)=0
We get rid of parentheses
0.2x-0.9x+5.4+0.9=0
We add all the numbers together, and all the variables
-0.7x+6.3=0
We move all terms containing x to the left, all other terms to the right
-0.7x=-6.3
x=-6.3/-0.7
x=+9
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