20+xx=2.5

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Solution for 20+xx=2.5 equation: 



20+xx=2.5

We move all terms to the left:

20+xx-(2.5)=0

We add all the numbers together, and all the variables

xx+17.5=0

We move all terms containing x to the left, all other terms to the right

xx=-17.5

x=-17.5/1

x=-17.5

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