7x-7x=21

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


Simplifying
7x + -7x = 21

Combine like terms: 7x + -7x = 0
0 = 21

Solving
0 = 21

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:

| .5(x-6)=.5 | | 5y^2+48y-20= | | -3(-6y+8)-y=3(y-4)-4 | | 7-9x=-8(x+1) | | (4.0*5x).6=97.2 | | 3(x-5)-14=2(x-7)+3 | | -15t^2+105t+10=190 | | X^4+x^2+9=0 | | 9y+6xy=30 | | 11(z+1)-2(z-3)=4(2-3) | | 6u+18=-4(u+8) | | -6x+y=12 | | 12-4x=-x | | (8x^3-2x^2+3x)+(5x^3+5x^2-10x)= | | 5m-14=3m | | -2a-13=-3-9 | | -5(2t-4)+2t=5t-3 | | 17x-13=11x+5 | | -31=7h+11 | | 4x^2-6=12x | | 4x-(3+2x)=17 | | -5(6x-6)+3=-30x+33 | | 3(-6X+9)+10X=3 | | -0.6b-4=-12 | | 4(x-2)=7x-5 | | 2(y+1)+4y=3(2y-1)+8 | | -0.6-4=-12 | | 3x-2=-15 | | 14+17m=16m+4 | | 8(u-1)-4=4(2u-3) | | 8=-8w+5(w+4) | | 13+2x+20+3x-11=180 |

Equations solver categories