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z in (-oo:+oo)
(4/5)*z+7 = (-1/5)*z // - (-1/5)*z
(4/5)*z-((-1/5)*z)+7 = 0
(4/5)*z+(1/5)*z+7 = 0
z+7 = 0 // - 7
z = -7
z = -7
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