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What is the coefficient should be for a position w

What is the coefficient should be for a position w-example-1

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\text{ALBr}_3+K_2SO_4\rightarrow KBr+Al_2(SO_4)_3
\begin{gathered} 2\text{AlBr}_3+3K_2SO_4\rightarrow6KBr+Al_2(SO_4)_3 \\ W=2 \\ X=3 \\ Y=6 \\ Z=1 \end{gathered}

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