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I assume you mean,
- 4V - 20 = 2V - 40
subtract 2V from each side
- 6V - 20 = - 40
add 20 to each side
- 6V = - 20
divide each sides integers by - 6
V = 20/6 = 10/3
============check in original equation
- 4(10/3) - 20 = 2(10/3) - 40
- 40/3 - 20 = 20/3 - 40
subtract 20/3 from both sides
- 60/3 - 20 = - 40
add 20 to each side
- 60/3 = - 20
- 20 = - 20
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