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0.15+0.05x=0.4
We move all terms to the left:
0.15+0.05x-(0.4)=0
We add all the numbers together, and all the variables
0.05x-0.25=0
We move all terms containing x to the left, all other terms to the right
0.05x=0.25
x=0.25/0.05
x=5
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