x+(x+1)=21

Simple and best practice solution for x+(x+1)=21 equation. Check how easy it is, and learn it for the future. Our solution is simple, and easy to understand, so don`t hesitate to use it as a solution of your homework.

If it's not what You are looking for type in the equation solver your own equation and let us solve it.

Solution for x+(x+1)=21 equation:


Simplifying
x + (x + 1) = 21

Reorder the terms:
x + (1 + x) = 21

Remove parenthesis around (1 + x)
x + 1 + x = 21

Reorder the terms:
1 + x + x = 21

Combine like terms: x + x = 2x
1 + 2x = 21

Solving
1 + 2x = 21

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-1' to each side of the equation.
1 + -1 + 2x = 21 + -1

Combine like terms: 1 + -1 = 0
0 + 2x = 21 + -1
2x = 21 + -1

Combine like terms: 21 + -1 = 20
2x = 20

Divide each side by '2'.
x = 10

Simplifying
x = 10

See similar equations:

| 10x+18x^2= | | 10x-5x+x=-1 | | y=-x^2+8x | | -5(3-z)=z+1 | | 2t+8t=40 | | 0.18(y-4)+0.10y=0.12y-0.05(40) | | 2x^3-2X^2-4x=0 | | 2(w+2)+2w=24 | | -6m^2=90 | | (5x+1)-2(4x+1)=0 | | 15x^2-14=29x | | 3x^2-8x+1.2=0 | | 3n+17=4n+16 | | 1-3x=2x-9 | | 36p^2=9 | | 5s^2-36s-32=0 | | k^2+6=31 | | y^2-18y+81=0 | | 2m/3+1/2=m/2 | | 4y^2+16x+7=0 | | w^2=40-3w | | n^2-4=60 | | k^2+1=-16 | | 2x+2=-20 | | 4x+5=2x-1 | | m/5=5 | | 4y^2-8y-5=0 | | 9n^2+6n-3=0 | | 4(3+2x)+8=92 | | X^2+8-5=0 | | b^2+8=44 | | n^2-2n-1=0 |

Equations solver categories