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2.5-0.4x=-0.9
We move all terms to the left:
2.5-0.4x-(-0.9)=0
We add all the numbers together, and all the variables
-0.4x+3.4=0
We move all terms containing x to the left, all other terms to the right
-0.4x=-3.4
x=-3.4/-0.4
x=8+0.2/0.4
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