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2.5-0.04x=-2.42
We move all terms to the left:
2.5-0.04x-(-2.42)=0
We add all the numbers together, and all the variables
-0.04x+4.92=0
We move all terms containing x to the left, all other terms to the right
-0.04x=-4.92
x=-4.92/-0.04
x=+123
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