solve the system (w+y+z)dw/dz +(w+x+z)dw/dy +(w+x+y)dw/dx=x+y+z
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Answer:
(w+y+z) +(w+x+z) +(w+x+y)
×dw/dz+x+y+z
+wd/dy×dw=dz
answer is (dz)
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