Exercise 1 Page 642

$\text{(I): }$ $\text{LHS}/8=\text{RHS}/8$

Put minus sign in front of fraction

$\frac{a}{b}=\frac{a/2}{b/2}$

$\frac{a\cdot b}{c}=\frac{a}{c}\cdot b$

$\text{(II): }$ $(\text{-}a{)}^2=a^2$

$\text{(II): }$ ${\left(ab\right)}^m=a^m{b}^m$

$\text{(II): }$ ${\left(\frac{a}{b}\right)}^m=\frac{a^m}{b^m}$

$\text{(II): }$ $\text{LHS}-2x^2=\text{RHS}-2x^2$

$\text{(II): }$ $a=\frac{16\cdot a}{16}$

$\text{(II): }$ Subtract terms

$\text{(II): }$ $\text{LHS}\cdot 16=\text{RHS}\cdot 16$

$\text{(II): }$ $\text{LHS}/(\text{-}7)=\text{RHS}/(\text{-}7)$