x + 2 = 10
x + 2 - 2 = 10 - 2
x = 8
x - 2 = 10
x - 2 + 2 = 10 + 2
x = 12
2x = 10
2x/2 = 10/2
x = 5
x/2 = 10
x/2 × 2 = 10 × 2
x = 20
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