5d-(3d+9)=21

Simple and best practice solution for 5d-(3d+9)=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 5d-(3d+9)=21 equation:


Simplifying
5d + -1(3d + 9) = 21

Reorder the terms:
5d + -1(9 + 3d) = 21
5d + (9 * -1 + 3d * -1) = 21
5d + (-9 + -3d) = 21

Reorder the terms:
-9 + 5d + -3d = 21

Combine like terms: 5d + -3d = 2d
-9 + 2d = 21

Solving
-9 + 2d = 21

Solving for variable 'd'.

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

Add '9' to each side of the equation.
-9 + 9 + 2d = 21 + 9

Combine like terms: -9 + 9 = 0
0 + 2d = 21 + 9
2d = 21 + 9

Combine like terms: 21 + 9 = 30
2d = 30

Divide each side by '2'.
d = 15

Simplifying
d = 15

See similar equations:

| -7=5/-5-1 | | 4y+4y+n= | | 5(x-7)+6=5x-29 | | 8x+78=8x+114 | | 8x+78=x+114 | | 77=9x+44+6x+3 | | .35-5a=2a | | (-4.9)X^2+3X-100=0 | | 3(x+8)=2(2x+13) | | 1+2logx=log(11x-3) | | 8x+74=2x+114 | | -5(2x-3)=2(x-6)-45 | | (-4.9)X^2+3X=100 | | 8x+73=2x+114 | | 14/9=7v | | 8+4x=3(-x+6)-24 | | 20=30-5x | | 1/3(2x-40)=4x | | 1.5d+4.25=2+2.25d | | -y=15-2x | | 6(2c+8)=132 | | 0.5(2d-6)=2 | | 6b+5=71 | | 8/9×10/3 | | 3a-6=4+a | | A-24=-5 | | 5/90=x/20 | | 3x-7=136 | | -4x-12=18-2x | | x=(1/2)x | | 4x+2x+x=10 | | f(12)=3x-5 |

Equations solver categories