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z in (-oo:+oo)
22-7 = (-5/8)*z+(1/2)*z+(3/4)*z // - (-5/8)*z+(1/2)*z+(3/4)*z
22-((-5/8)*z)-((1/2)*z)-((3/4)*z)-7 = 0
(5/8)*z+(-1/2)*z+(-3/4)*z-7+22 = 0
15-5/8*z = 0 // - 15
-5/8*z = -15 // : -5/8
z = -15/(-5/8)
z = 24
z = 24
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