140-4a=180

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Solution for 140-4a=180 equation: 



140-4a=180

We move all terms to the left:

140-4a-(180)=0

We add all the numbers together, and all the variables

-4a-40=0

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

-4a=40

a=40/-4

a=-10

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