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11-88.

Multiply the entire equation by x and x − 7.

3x − 21 + 5x = −2x2 + 14x

Set the equation into standard format.

2x2 − 6x − 21 = 0

Use the quadratic formula.

Multiply by the entire equation by 12.

6x + 9 − 2x + 14 = 2x − 3

Solve for x.

2x = −26

x = −13