20a+50=290

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Solution for 20a+50=290 equation: 



20a+50=290

We move all terms to the left:

20a+50-(290)=0

We add all the numbers together, and all the variables

20a-240=0

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

20a=240

a=240/20

a=12

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