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(-1/4)*(6*z-4) = (13*x)/2+9 // - (13*x)/2+9
(-1/4)*(6*z-4)-((13*x)/2)-9 = 0
(-1/4)*(6*z-4)+(-13/2)*x-9 = 0
(-13*x)/2-1/4*(6*z-4)-9 = 0
(-1/4*2*(6*z-4))/2+(-13*x)/2+(-9*2)/2 = 0
-1/4*2*(6*z-4)-13*x-9*2 = 0
2-13*x-3*z-18 = 0
-13*x-3*z-16 = 0
(-13*x-3*z-16)/2 = 0
(-13*x-3*z-16)/2 = 0 // * 2
-13*x-3*z-16 = 0
-13*x-3*z-16 = 0 // + -3*z-16
-13*x = -(-3*z-16) // : -13
x = (-(-3*z-16))/(-13)
x = (16-(-3*z))/(-13)
x = (16-(-3*z))/(-13)
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