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2.5-0.5x=-3
We move all terms to the left:
2.5-0.5x-(-3)=0
We add all the numbers together, and all the variables
-0.5x+5.5=0
We move all terms containing x to the left, all other terms to the right
-0.5x=-5.5
x=-5.5/-0.5
x=+11
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