21=4u-u

Simple and best practice solution for 21=4u-u 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=4u-u equation:


Simplifying
21 = 4u + -1u

Combine like terms: 4u + -1u = 3u
21 = 3u

Solving
21 = 3u

Solving for variable 'u'.

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

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

Combine like terms: 3u + -3u = 0
21 + -3u = 0

Add '-21' to each side of the equation.
21 + -21 + -3u = 0 + -21

Combine like terms: 21 + -21 = 0
0 + -3u = 0 + -21
-3u = 0 + -21

Combine like terms: 0 + -21 = -21
-3u = -21

Divide each side by '-3'.
u = 7

Simplifying
u = 7

See similar equations:

| .13x=32+5x | | x(3x+3)=210 | | 3e^5= | | -12=8(u+2)-4u | | 5Y+16=7Y | | x(4x+5)=360 | | 7n-17n=80 | | 700+20x=4300 | | 7n-17n=18 | | -37=5(x-8)-2x | | 3tan(x)+1=4 | | 2(3s+5)=22 | | -750.00+150x=-150 | | 3x+5y=777 | | 6(t-2)=2(9-t) | | 5x+3y=12320 | | s(s^2+25)=0 | | 3tan(x)-3=0 | | 3tanx+1=4 | | Ix+3I=-4 | | 3x-13-x=3 | | x-9y=15 | | 9x+14=7x-5 | | 10x-5+2x+5=180 | | 7n-n=2202 | | 4(sl+5)=108 | | 2x-13+3x=17 | | 0.30(24)+.05x=.15(6+x) | | 4+9+7=31 | | 2-x=68 | | (u-7)*10=80 | | (u-7)810=80 |

Equations solver categories