Choose the set coefficients that correctly balances the following equation : `xCr_(2)O_(7)^(2-)+yH^(+)+ze^(-)rarraCr^(+3)++bH_(2)O`

Choose the set coefficients that correctly balances the following equation : `xCr_(2)O_(7)^(2-)+yH^(+)+ze^(-)rarraCr^(+3)++bH_(2)O`
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Choose the set coefficients that correctly balances the following equation : `xCr_(2)O_(7)^(2-)+yH^(+)+ze^(-)rarraCr^(+ ... (x,y,z,a,b),(2,7,6,1,7):}`
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