20+2a=12

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Solution for 20+2a=12 equation: 



20+2a=12

We move all terms to the left:

20+2a-(12)=0

We add all the numbers together, and all the variables

2a+8=0

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

2a=-8

a=-8/2

a=-4

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