21=3-3a+6

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


Simplifying
21 = 3 + -3a + 6

Reorder the terms:
21 = 3 + 6 + -3a

Combine like terms: 3 + 6 = 9
21 = 9 + -3a

Solving
21 = 9 + -3a

Solving for variable 'a'.

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

Add '3a' to each side of the equation.
21 + 3a = 9 + -3a + 3a

Combine like terms: -3a + 3a = 0
21 + 3a = 9 + 0
21 + 3a = 9

Add '-21' to each side of the equation.
21 + -21 + 3a = 9 + -21

Combine like terms: 21 + -21 = 0
0 + 3a = 9 + -21
3a = 9 + -21

Combine like terms: 9 + -21 = -12
3a = -12

Divide each side by '3'.
a = -4

Simplifying
a = -4

See similar equations:

| 2x-5(x-4)=-8+4x+14 | | 5106=2000*t | | 5x+6x+3=11x+1-6 | | 4k-6=2k+11 | | w+-39=55 | | 1.6=x-3.2 | | 30/75=c | | 6(5a-a)+4(2+4b)= | | 5z=20z^2 | | 4x+7(-4x-10)=74 | | x^2+14x-119=0 | | (3xm)+2-6=16 | | (3+-8z)(1+-1z)=0 | | 6y^2-4y+2y^2-8y= | | g+-7=19 | | 8z^2=11z+-3 | | 2x+72=5 | | x^2-22x=-57 | | -8+w=-11 | | 5cos(x+2)=1 | | q+6=4 | | -14x-14=56 | | 60=-16x^2+13x | | .6(10000)+.08x=.072(10000+x) | | 4(3a+1+2b)= | | -10+8x-4=-14-5x+13x | | 4y^4-4y^3+y^2=0 | | log[4](2x+3)=log[4](44-x)-log[4](x-2) | | 15(t-2)+6t=7(3t+3)-11 | | Xsquared-3x=70 | | 3x+20y=120 | | 5/8=x/40 |

Equations solver categories