77÷(x+9)=7 can be simplified by dividing both sides by 7. We get:
11 ÷ (x+9) = 1. We can invert both sides to get x+9 into the numerator: (x+9)/11 = 1/1. Then x+9 = 11. Subtracting 2 from both sides, we get: x = 2.
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