20a-40=100

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Solution for 20a-40=100 equation: 



20a-40=100

We move all terms to the left:

20a-40-(100)=0

We add all the numbers together, and all the variables

20a-140=0

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

20a=140

a=140/20

a=7

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