3*[5-x]=21

Simple and best practice solution for 3*[5-x]=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 3*[5-x]=21 equation:


Simplifying
3[5 + -1x] = 21
[5 * 3 + -1x * 3] = 21
[15 + -3x] = 21

Solving
15 + -3x = 21

Solving for variable 'x'.

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

Add '-15' to each side of the equation.
15 + -15 + -3x = 21 + -15

Combine like terms: 15 + -15 = 0
0 + -3x = 21 + -15
-3x = 21 + -15

Combine like terms: 21 + -15 = 6
-3x = 6

Divide each side by '-3'.
x = -2

Simplifying
x = -2

See similar equations:

| 5log(3x)=20 | | 0.5x-0.3(2-x)=46 | | 15(6x-7)=6x-8 | | 2(5z+1)-9=73 | | 3*-20+10=4 | | 14x-(6x-8)=16 | | 3(2x-5)+4x=10 | | 2x-6+2(4x)+13=-2-5x+(3squ-3) | | 2-3(4x-5)=15 | | 2(3x+7)=4(5x-1)+18 | | 4z^2+2z-3=0 | | 3.87n=4+2.247n | | 2cos(5x)=0 | | 9m^2+10m=0 | | 3x(x-1)=8 | | 3x^2-6x-2=-x^2+x | | 10x^3-20x^2-25x= | | 11z-18=59 | | 2x^2+7x+-125=0 | | f(x)=8-11(-2) | | 5x+2+8x+4+y=15x-18 | | x^2-25=-7 | | 7+36x^2=16 | | -2(x+1)(x-3)(x-7)=0 | | 5(x+3)=ax+5 | | f(x)=8-11(-4) | | -5(n-3)+5=-3n+8-5n | | 10x+2-3x=3(2x+2) | | F(x)=8-11x | | x^2(x^2-5x+6)=0 | | 8x+2-2x=3x+14 | | v=2i+3j-6k |

Equations solver categories