What is the answer to 7|3x-12|=21 ?

The answer to 7|3x-12|=21 is x=3\lor x=5

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7|3x-12|=21

7 ∣ 3 x - 12 ∣ = 21

x = 3 or x = 5

Solution steps

7 ∣ 3 x - 12 ∣ = 21

Divide both sides by

7

∣ 3 x - 12 ∣ = 3

Apply absolute rule: If

∣ u ∣ = a, a > 0

then

u = a

u = - a

3 x - 12 = - 3 or 3 x - 12 = 3

3 x - 12 = - 3 or 3 x - 12 = 3

x = 3 or x = 5

\frac{\frac{2 U}{5}}{x}

4 r + 12 s + 36

30 + 6 p = 7 (p + 6) - 5

y^{2} - (x^{2} - 8 x + 16)

4 x^{2} - 7 = 21