Question 303264
-2x+3y-5z+w=0
2X-3Y+5Z-W=0 SUBTRACT FROM THE OTHER EQUATION.
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4x-6y+10z-2w=0
2(2X-3Y)+2(5Z-W)=0
-(2X-3Y)-(5Z-W)=0
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(2X-3Y)+(5Z-W) ANS.