21=8a+4

Simple and best practice solution for 21=8a+4 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=8a+4 equation:


Simplifying
21 = 8a + 4

Reorder the terms:
21 = 4 + 8a

Solving
21 = 4 + 8a

Solving for variable 'a'.

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

Add '-8a' to each side of the equation.
21 + -8a = 4 + 8a + -8a

Combine like terms: 8a + -8a = 0
21 + -8a = 4 + 0
21 + -8a = 4

Add '-21' to each side of the equation.
21 + -21 + -8a = 4 + -21

Combine like terms: 21 + -21 = 0
0 + -8a = 4 + -21
-8a = 4 + -21

Combine like terms: 4 + -21 = -17
-8a = -17

Divide each side by '-8'.
a = 2.125

Simplifying
a = 2.125

See similar equations:

| X^2+y^2-23=0 | | -3(10z+4)+5(z+2)= | | -2(-10-7x)=48 | | -4z-z=5z+8+z | | -2x+16=-2(x-6) | | 7(6-k)=56 | | 4r-7=17r | | 42x+84=42x+100 | | 7x+1-3x=9 | | 150-35g=45 | | 0.75+b=8.5 | | -4(y+3)+12=400 | | 5x-4(5x+4)= | | 3(-5x-3)+2x-3=2 | | 9(x+12)=0 | | 56=4t | | h=-16t^2+320t | | -w+2x-3y+z=-9 | | 21x+16x= | | 2w+3=w+6 | | 5*(n-1)= | | 5c+6c= | | 1.5x+1=1.5 | | 8.50d+55=123 | | 3(x-3)=3x+12 | | 2x+2(6x+4)=15 | | -4(-2-6x)=248 | | -4.56u-9.1=8.324+0.28 | | 2b^2-12b+15=0 | | -28=4x+3x | | -(-n-4)=10-n | | -0.849+x=-1.841 |

Equations solver categories