21=x+2*x

Simple and best practice solution for 21=x+2*x 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 21=x+2*x equation:


Simplifying
21 = x + 2x

Combine like terms: x + 2x = 3x
21 = 3x

Solving
21 = 3x

Solving for variable 'x'.

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

Add '-3x' to each side of the equation.
21 + -3x = 3x + -3x

Combine like terms: 3x + -3x = 0
21 + -3x = 0

Add '-21' to each side of the equation.
21 + -21 + -3x = 0 + -21

Combine like terms: 21 + -21 = 0
0 + -3x = 0 + -21
-3x = 0 + -21

Combine like terms: 0 + -21 = -21
-3x = -21

Divide each side by '-3'.
x = 7

Simplifying
x = 7

See similar equations:

| 2+30p-24=11p-9 | | -4x+y=27 | | b^4+73b^2+72= | | 2-(7x+8)=-3(-x-8) | | -119-2x=49+5x | | 3x-4y=x-y | | 4(z+5)=15 | | 8n-8(6+4n)=-120 | | 3x+8y=41 | | .15x=.06 | | -9(-5x+4)=-261 | | 5y-6y=-4 | | -2(6-x)+4x=8(2x+5) | | 3(2)2+8=20 | | 4-(-70n)+56=-269 | | 7-5(p-8)=1-p | | -9-5=5x+7-4x | | 12-7(3-5r)+8r= | | 4(8-n)=-2(2-7n) | | -122=8-5(-4p-6) | | 3p-12=12 | | 4--70+56=-269 | | 7x+6(5x-5)=155 | | 2x-0.4=18 | | 3B-15=8B-20 | | 4-(-70)+56=-269 | | 7x-4+19+10x+3=52 | | 9a-(72)=0 | | 2x-6+x-1=3(x-3)+2 | | 5g+35=10 | | 3*x-2=2*x+4 | | 14x+23=0 |

Equations solver categories