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12x - 5 = 11x + 5

(1) add 5 to both sides:

12x - 5 + 5 = 11x + 5 + 5

12x = 11x + 10

(2) next subtract 11x from both sides:

12x - 11x = 11x - 11x + 10

x = 10

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13y ago

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