Answer:
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[tex]\green{\longmapsto}\boxed{\blue{7z - 4q = 3} }[/tex]
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[tex]7z = 4q + 3 \\ z = \frac{4q + 3}{7} \\ \boxed{\red{z =\frac{4q}{7} + \frac{3}{7} }}[/tex]
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[tex] - 4q = 3 - 7z \\ 4q = 7z - 3 \\ q = \frac{7z - 3}{4} \\ \boxed{\red{q = \frac{7z}{4} - \frac{3}{4} }}[/tex]
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