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0.9*x=0.5
We move all terms to the left:
0.9*x-(0.5)=0
We add all the numbers together, and all the variables
0.9x-0.5=0
We move all terms containing x to the left, all other terms to the right
0.9x=0.5
x=0.5/0.9
x=0.5/0.9
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