Question

1/2s=4s-21 I don't understand

Answer 1

$\frac{1}{2} s$ = 4s - 21

First, simplify $\frac{1}{2} s$ to $\frac{s}{2}$ / Your problem should look like: $\frac{s}{2} = 4s - 21$
Second, multiply both sides by 2. / Your problem should look like: $s = 8s - 42$
Third, subtract 8s from both sides. / Your problem should look like: $s - 8s = -42$
Fourth, simplify s - 8s to -7s. / Your problem should look like: $-7s = -42$
Fifth, divide both sides by -7. / Your problem should look like: $s = \frac{-42}{-7}$
Sixth, simplify $\frac{42}{-7}$ to $- \frac{42}{7}$ / Your problem should look like: $s = \frac{42}{7}$
Seventh, simplify $\frac{42}{7}$ to 6. / Your problem should look like: $s = 6$

Answer: s = 6