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D( x )
7*x+3 = 0
7*x+3 = 0
7*x+3 = 0
7*x+3 = 0 // - 3
7*x = -3 // : 7
x = -3/7
x in (-oo:-3/7) U (-3/7:+oo)
9/(7*x+3)-((42*y)/6)+5*10*z = 0
9/(7*x+3)-7*y+5*10*z = 0
9/(7*x+3)-7*y+50*z = 0
9/(7*x+3)+(-7*y*(7*x+3))/(7*x+3)+(50*z*(7*x+3))/(7*x+3) = 0
50*z*(7*x+3)-7*y*(7*x+3)+9 = 0
350*x*z-49*x*y-21*y+150*z+9 = 0
(350*x*z-49*x*y-21*y+150*z+9)/(7*x+3) = 0
(350*x*z-49*x*y-21*y+150*z+9)/(7*x+3) = 0 // * 7*x+3
350*x*z-49*x*y-21*y+150*z+9 = 0
350*x*z-21*y+150*z+9 = 0 // - 150*z-21*y+9
350*x*z = -(150*z-21*y+9) // : 350*z
x = (-(150*z-21*y+9))/(350*z)
x = (-1/350)*z^-1*(150*z-21*y+9)
x = (-1/350)*z^-1*(150*z-21*y+9)
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