Question

21-3(x-7)=x+20 solve the following

Answer 1

21-3x+21=x+20
42-3x=x+20
x+3x=42-20
4x=22
x=21/4=5.5
x=5.5

HOPE THIS WILL HELP U

Answer 2

Answer:

=> $x = \frac{11}{2}$

Step-by-step explanation:

Given that:-

$21-3(x-7)=x+20$

To find:- The value of the expression,  

For calculating the value of x, we have to apply the transposition method:

As we have,

=> $21-3(x-7)=x+20$

First of all, distribute the terms:

=> $21-3x-21=x+20$

Add the numbers,

=> $42-3x=x+20$

Rearrange the terms,

=> $-3x+42=x+20$

Subtract $42$ from both sides,

=> $-3x+42-42=x+20-42$

Simplifying it further,

=> $-3x = x - 22$

Subtract $x$ from both sides,

=> $-3x -x= x - 22-x$

$=> - 4x = -22$

Divide both sides by $-4$,

=> $x=\frac{-22}{-4}$

Canceling the terms and the negative sign,

=> $x = \frac{11}{2}$