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(-2/5)*x-((5/2)*z) = 0
(-2/5)*x+(-5/2)*z = 0
-2/5*x-5/2*z = 0 // + -5/2*z
-2/5*x = -(-5/2*z) // : -2/5
x = (-(-5/2*z))/(-2/5)
x = -25/4*z
x = -25/4*z
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