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x in (-oo:+oo)
(-1/9)*(z+6) = (1/9)*(x-(4/5)) // - (1/9)*(x-(4/5))
(-1/9)*(z+6)-((1/9)*(x-(4/5))) = 0
(-1/9)*(z+6)+(-1/9)*(x-4/5) = 0
-1/9*(z+6)-1/9*(x-4/5) = 0
-1/9*(z+6)-1/9*(x-4/5) = 0
-1/9*x-1/9*z-26/45 = 0
-1/9*x-1/9*z-26/45 = 0
-1/9*x-1/9*z-26/45 = 0 // + -1/9*z-26/45
-1/9*x = -(-1/9*z-26/45) // : -1/9
x = (-(-1/9*z-26/45))/(-1/9)
x = -9*(26/45-(-1/9*z))
x = -9*(26/45-(-1/9*z))
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