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z in (-oo:+oo)
2*z+6 = (5*z)/2 // - (5*z)/2
2*z-((5*z)/2)+6 = 0
2*z+(-5/2)*z+6 = 0
6-1/2*z = 0 // - 6
-1/2*z = -6 // : -1/2
z = -6/(-1/2)
z = 12
z = 12
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