z+2 / z+5 = z / z+6
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z + 2 / z+5 = z / z + 6
( z + 2 )( z + 6 ) = z ( z + 5 )
z² + 8z + 12 = z² + 5z
z² - z² + 8z - 5z + 12 = 0
3z = -12
z = -12/3
z = -4
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