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Answer:
12 - x = 20 - 5x
Add 5x on both sides,
12 - x + 5x = 20 - 5x
12 + 4x = 20
Subtract 12 on both sides,
12 - 12 + 4x = 20 - 12
4x = 8
Divide 4 on both sides,
4x / 4 = 8 / 4
x = 2
Hence proved.