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0.4x+0.9=1.5
We move all terms to the left:
0.4x+0.9-(1.5)=0
We add all the numbers together, and all the variables
0.4x-0.6=0
We move all terms containing x to the left, all other terms to the right
0.4x=0.6
x=0.6/0.4
x=1+0.2/0.4
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