20a-30a=40

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Solution for 20a-30a=40 equation: 



20a-30a=40

We move all terms to the left:

20a-30a-(40)=0

We add all the numbers together, and all the variables

-10a-40=0

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

-10a=40

a=40/-10

a=-4

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