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z in (-oo:+oo)
(7/12)*z = 1/9-(15/14) // - 1/9-(15/14)
(7/12)*z-(1/9)+15/14 = 0
(7/12)*z-1/9+15/14 = 0
7/12*z+121/126 = 0 // - 121/126
7/12*z = -121/126 // : 7/12
z = -121/126/7/12
z = -242/147
z = -242/147
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