Question

Solve: ${\displaystyle \frac{\text{z}}{7}+1=2\frac{1}{2}}$

Answer 1

${\displaystyle \frac{\text{z}}{7}+1=2\frac{1}{2}}$

⇒ ${\displaystyle \frac{\text{z}}{7}+1=\frac{5}{2}}$

⇒ ${\displaystyle \frac{\text{z}}{7}=\frac{5}{2}-1}$

⇒ ${\displaystyle \frac{\text{z}}{7}=\frac{5-2}{2}}$

⇒ ${\displaystyle \frac{\text{z}}{7}=\frac{3}{2}}$

⇒ ${\displaystyle \text{z}=\frac{3}{2}\times 7}$

⇒ ${\displaystyle \text{z}=\frac{21}{2}}$

⇒ ${\displaystyle \text{z}=10\frac{1}{2}}$