21-12=

Simple and best practice solution for 21-12= 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 21-12= equation: 


Simplifying
21 + -12 = 0

Combine like terms: 21 + -12 = 9
9 = 0

Solving
9 = 0

Couldn't find a variable to solve for.

This equation is invalid, the left and right sides are not equal, therefore there is no solution.

See similar equations:

| x^2-8x+17=0 | | A-7=21 | | 5.362+9.8= | | 4Z-3=8Z+5 | | x(x-8)=9 | | 5N+2(N-2)=-18 | | 3x^2-x=4 | | 6x^2-6x-11=0 | | -12+4(x-4)=-2 | | (1.5a^3)x(4a^6)= | | 11x+42x=10567 | | 6x(x-1)=11 | | 12.035=x+6.1 | | 3(k-6)+2=35 | | 2x+45=5x+12 | | 8X+48-3X=3 | | 8x^2-6=0 | | x-83=417 | | 8x^2-50=0 | | 2(x+y)+3(x+y)= | | w-3+(-9)= | | (2x^4-13x^3+17x^2+18x-24)= | | 7d+d-4D-7d=5d | | 4.2=10x+7.3 | | 0=-5n+-2n | | 8(x*x+2*2)=392 | | T*T+16=25 | | 5(2n-4)=-8(-5n-5) | | 8x-15=5x+12 | | 2a+6b-2a-b= | | 4+6(x+6)=10x-5(x-6) | | 3u^2=18u-6 |

Equations solver categories