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I was taught that you could move any term from one side of an equation to the other as long as you changed its sign:

4 + 10 = 8x - 2x

14 = 6x

x = 7/3 ie Two-and-a-third

Check: 2 x 7/3 + 4 = 8 & 2/3; -10 + 56/3 = -10 + 18 & 2/3 = 8 & 2/3. Boom-boom!

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14y ago
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Q: 2x plus 4 equals -10 plus 8x?
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