Question

Solve the equation: 21 − 3(x − 7) = x + 20​

Answer 1

Answer:

21 – 3 (x – 7) = x + 20

☁⇒ 21 – 3x + 21 = x + 20 ⇒ 42 – 3x = x + 20

☁⇒ 42 – 20 = x + 3x ⇒ 4x = 22

☁⇒ x = 22/4 = 11/2 = 5.1/2

☁∴ x = 5.1/2

Answer 2

Given :-

$\sf 21 − 3(x − 7) = x + 20$

To Find :-

• Value of x

Solution :-

$\sf 21 − 3(x − 7) = x + 20$

$\implies \sf21 - 3x + 21 = x + 20$

$\implies \sf 42 - 3x = x + 20$

$\implies \sf - 3x - x = 20 - 42$

$\implies \sf - 4x = - 22$

$\implies \sf \: x = \frac{ - 22}{ - 4}$

$\implies \sf \: x = 5.5$