20a-30=40

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Solution for 20a-30=40 equation: 



20a-30=40

We move all terms to the left:

20a-30-(40)=0

We add all the numbers together, and all the variables

20a-70=0

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

20a=70

a=70/20

a=3+1/2

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