-21=1+3r+8r

Simple and best practice solution for -21=1+3r+8r 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=1+3r+8r equation:


Simplifying
-21 = 1 + 3r + 8r

Combine like terms: 3r + 8r = 11r
-21 = 1 + 11r

Solving
-21 = 1 + 11r

Solving for variable 'r'.

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

Add '-11r' to each side of the equation.
-21 + -11r = 1 + 11r + -11r

Combine like terms: 11r + -11r = 0
-21 + -11r = 1 + 0
-21 + -11r = 1

Add '21' to each side of the equation.
-21 + 21 + -11r = 1 + 21

Combine like terms: -21 + 21 = 0
0 + -11r = 1 + 21
-11r = 1 + 21

Combine like terms: 1 + 21 = 22
-11r = 22

Divide each side by '-11'.
r = -2

Simplifying
r = -2

See similar equations:

| 18-2z+5z=9 | | 60W-L=L^2 | | t-19=-23 | | 2(4r+6)=.5(12r+18) | | p+11.7=-4.3 | | X=-8+3x | | 7x^2+35x-42= | | -163=5+6(-8-4n) | | (2-x)(2+x)-(2-x)(x+3)=x(2-x) | | 3a^2+6a-9=0 | | x+6(x-1)=3+x | | (2z^12)(-5z^6)(z^4)= | | x^2+2x=2x-2 | | r+9=22 | | 35v^2-51v-16=-8 | | -13x=-11x+38 | | 2x+65+25=180 | | 7n-2=14+4n-n | | 23+x=-19 | | 10x-30=2x+6 | | x-8.3=-6.7 | | x(x)-81=0 | | sin^2(x)-3sin(x)-4=0 | | sec^2x-2.5=0 | | 5x+4=6x-10 | | 3x+4(-x+16)=70 | | a^3+4=68 | | (9x+8)(4x^2+7x+8)= | | 8b+4b-6=55 | | a+4=68 | | 6-3n=-18 | | -2.6=-2y+1.4 |

Equations solver categories