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4*y-(x*((24*z)/3))-21 = 0
4*y-8*x*z-21 = 0
4*y-8*x*z-21 = 0 // - 4*y-21
-8*x*z = -(4*y-21) // : -8*z
x = (-(4*y-21))/(-8*z)
x = (21-(4*y))/(-8*z)
x = (21-(4*y))/(-8*z)
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