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Z-((2/3)*(x-12)) = 0
(-2/3)*(x-12)+Z = 0
Z-2/3*(x-12) = 0
Z-2/3*(x-12) = 0
Z-2/3*x+8 = 0
Z-2/3*x+8 = 0
Z-2/3*x+8 = 0 // - Z+8
-2/3*x = -(Z+8) // : -2/3
x = (-(Z+8))/(-2/3)
x = 3/2*(Z+8)
x = 3/2*(Z+8)
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