a-7+a=-21

Simple and best practice solution for a-7+a=-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 a-7+a=-21 equation:


Simplifying
a + -7 + a = -21

Reorder the terms:
-7 + a + a = -21

Combine like terms: a + a = 2a
-7 + 2a = -21

Solving
-7 + 2a = -21

Solving for variable 'a'.

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

Add '7' to each side of the equation.
-7 + 7 + 2a = -21 + 7

Combine like terms: -7 + 7 = 0
0 + 2a = -21 + 7
2a = -21 + 7

Combine like terms: -21 + 7 = -14
2a = -14

Divide each side by '2'.
a = -7

Simplifying
a = -7

See similar equations:

| 9(r-7)-10(r-5)=-19 | | -7(2k+1)=91 | | 11=v+9 | | -3.5+12.8= | | .2x-4.6=2.4 | | 3(2x-1)=9x+2x | | -2x-8=-36 | | 18=t/-2 | | (32x+2y)=(19x+4y) | | 1+6n-8n=-15 | | 3y+2y-12=13 | | 5-3b-3b=5 | | (18x+3y)=(6x+10y) | | x-y=5x+8y | | X/2-2=2 | | 2n+1+3n=1 | | 4x-12=2(x+10) | | 2-4z=-3 | | 7a-2+5=17 | | x^2-13x+17=-6x+5 | | 7(4x-3)-9(2x+1)=2(x-9) | | (3x+3y)=(-3x+17y) | | 5n-9=-39 | | 4p-2=-5p-5 | | 6a^2+24a=126 | | -6x-12=24 | | 3-6j=-9 | | 2.4/1.6 | | x^2-x+3=4x-1 | | 7(n-7)=35 | | 3.3x-22=21x+30 | | 6x+4(3x-34)=-334 |

Equations solver categories