21-b=42

Simple and best practice solution for 21-b=42 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-b=42 equation: 


Simplifying
21 + -1b = 42

Solving
21 + -1b = 42

Solving for variable 'b'.

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

Add '-21' to each side of the equation.
21 + -21 + -1b = 42 + -21

Combine like terms: 21 + -21 = 0
0 + -1b = 42 + -21
-1b = 42 + -21

Combine like terms: 42 + -21 = 21
-1b = 21

Divide each side by '-1'.
b = -21

Simplifying
b = -21

See similar equations:

| 21x^2+19x-2=0 | | 7(1x+1/2)=91/2 | | 2X+5=-4X+8 | | 4a+5b=198 | | -3/4t=-9 | | a+3/4=5a-5/8 | | 4k+17=1 | | -4(2+5x)=-88 | | 1/2x-8 | | x-9/5+9/5=-x/7 | | -12a-17b-18c+18a+18b+25c= | | 2(4x-11)=10 | | 2z^2-13z+6=0 | | 2-3(y+2)=2(y-4) | | 5f-70=60 | | 4x+5y=97 | | 5(12)+7(-7)= | | -5/6z=-20 | | 5z^2+28z+15=0 | | -1/2+4x=109/2 | | 3/2w+7n+1/2w | | 56+5F/6=206 | | 6x-6+3x=57 | | 3x+18/4x+4/5=11 | | k=c+dg | | 2n+3n=90 | | (2+u)(3u-4)=0 | | 7b-3.5=2b+9 | | x+8=8(x-3)-7x | | 7-4/3c=22 | | 0.3x-0.8x+3=8 | | 0.90x+0.05(2-x)=0.10(-16) |

Equations solver categories