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0=-2.5x-50
We move all terms to the left:
0-(-2.5x-50)=0
We add all the numbers together, and all the variables
-(-2.5x-50)=0
We get rid of parentheses
2.5x+50=0
We move all terms containing x to the left, all other terms to the right
2.5x=-50
x=-50/2.5
x=-20
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