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(1/2)*(4*z+10)-z-8 = 0
1/2*(4*z+10)-z-8 = 0
1/2*(4*z+10)-z-8 = 0
z-8+5 = 0
z-3 = 0
z-3 = 0
z-3 = 0 // + 3
z = 3
z = 3
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