3r+6=21

Simple and best practice solution for 3r+6=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 3r+6=21 equation:


Simplifying
3r + 6 = 21

Reorder the terms:
6 + 3r = 21

Solving
6 + 3r = 21

Solving for variable 'r'.

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

Add '-6' to each side of the equation.
6 + -6 + 3r = 21 + -6

Combine like terms: 6 + -6 = 0
0 + 3r = 21 + -6
3r = 21 + -6

Combine like terms: 21 + -6 = 15
3r = 15

Divide each side by '3'.
r = 5

Simplifying
r = 5

See similar equations:

| 9x^4-18x^3+27x^2= | | 2x-6+3x+5+x-2=180 | | 2x-6+3x+5= | | 5n(4n+18)=0 | | 0=x^2+4y^2 | | -9(9/7-9)-(9/7+1)=1 | | 10=20t-5t^2 | | x^3-5x^2-8x=-12 | | s^3-100=0 | | (7a-3)+(4a-9)=(a+8)-(4a+1) | | 5x^2+6x-32= | | (17+3x)-(x-4)=(9-3x)-(2x+5)-4 | | x^3+8x^2+7x+56= | | 17+3x-x-4=9-3x-2x+5-4 | | x^2-12x-45= | | x^3-3x^2-28x= | | (8n-6)+(2n+3)=(n+5)-(2n-7) | | 32y^2-18= | | x^2+2x+6= | | (2a-3)+(7a-6)=13a-(5a-10) | | 15t+7t-t= | | 6r-10r-4r= | | -2.1(1.7x+0.9)=-22.01x-4.03 | | x(18.44)=-2.14 | | -4.03+1.89=x | | -3.57+22.01=x | | -2.1(0.9)=x | | -2.1(1.7)=x | | 3.1(-1.3)=x | | -7.1(3.1)=x | | 12-(2n+8)=n+8 | | 2(4x-3)=4x+5 |

Equations solver categories