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2.5-0.04x=-1.9
We move all terms to the left:
2.5-0.04x-(-1.9)=0
We add all the numbers together, and all the variables
-0.04x+4.4=0
We move all terms containing x to the left, all other terms to the right
-0.04x=-4.4
x=-4.4/-0.04
x=+110
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