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x*0.4=0.15
We move all terms to the left:
x*0.4-(0.15)=0
We add all the numbers together, and all the variables
x*0.4-0.15=0
Wy multiply elements
0.4x-0.15=0
We move all terms containing x to the left, all other terms to the right
0.4x=0.15
x=0.15/0.4
x=0.15/0.4
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