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Q:

यदि $${3x+4y-2z+9=17},{7x+2y+11z+8=23}$$  तथा $$ {5x+9y+6z-4=18}$$ हैं, तो $$ {x+y+z-34}$$ का मान क्या है?

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    -31
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Answer : 2. "-31"

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