Try the following GMAT Quantitative Reasoning question on manipulating linear equations to find value of an expression involving three variables.
Question 69:
Given $2x+y+z=3$ and $5x+3y+z=8$, what is the value of $x+y-z$ ?
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$\quad -2$
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$\quad -1$
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$\quad 0$
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$\quad 1$
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$\quad 2$
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