What is the answer to | r/3 |=5 ?

The answer to | r/3 |=5 is r=-15\lor r=15

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| r/3 |=5

\frac{r}{3} = 5

r = - 15 or r = 15

Solution steps

\frac{r}{3} = 5

Apply absolute rule: If

∣ u ∣ = a, a > 0

then

u = a

u = - a

\frac{r}{3} = - 5 or \frac{r}{3} = 5

\frac{r}{3} = - 5 or \frac{r}{3} = 5

r = - 15 or r = 15

∣ 8 - 7 b ∣ - 5 = 4

∣ r + 5 ∣ = 2

∣ 5 x - 4 ∣ + 3 = 3

∣ x - 3 ∣ = x - 1

∣ x + 4 ∣ - ∣ x - 2 ∣ = 10