5a-4(3a+7)=21

Simple and best practice solution for 5a-4(3a+7)=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 5a-4(3a+7)=21 equation:


Simplifying
5a + -4(3a + 7) = 21

Reorder the terms:
5a + -4(7 + 3a) = 21
5a + (7 * -4 + 3a * -4) = 21
5a + (-28 + -12a) = 21

Reorder the terms:
-28 + 5a + -12a = 21

Combine like terms: 5a + -12a = -7a
-28 + -7a = 21

Solving
-28 + -7a = 21

Solving for variable 'a'.

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

Add '28' to each side of the equation.
-28 + 28 + -7a = 21 + 28

Combine like terms: -28 + 28 = 0
0 + -7a = 21 + 28
-7a = 21 + 28

Combine like terms: 21 + 28 = 49
-7a = 49

Divide each side by '-7'.
a = -7

Simplifying
a = -7

See similar equations:

| 3x+9=10x-5 | | (x+3)(x+3)= | | 10z-4=2(5z-2) | | 5q^2+13q-60=0 | | -1+14j=20j-7 | | x^2-5x+25=0 | | 2(x+3)+3x=-4 | | 1.9q-1.9-2.3q=-1.4q-3.5 | | -x^2+4x-20=0 | | 3z+1=5z+19 | | 4x/3-8=4 | | 6+2x=x-1 | | 5x+2=-2x+16 | | -2g+9=-18-4g-9 | | 105=2x-11 | | 5e^7t=9e^6t | | 3(x-5)=-8.4 | | 5y-4(2y-10)=25 | | 3y^2+4y+1=0 | | 105=2x-1 | | 2(a+8)=28.2 | | (x+1)(4x-56)=180 | | 8-n+9=-10+8n | | 26x=13x | | 8.7=9c-3 | | 10-7x=210-42x | | d+9=-8d | | 2e-1=13.4 | | 5-3x=-5-7(3x-4) | | (15x-6)-6x=(9x+6) | | 9+5t=4t+1 | | 3*-1-5*0=9*1 |

Equations solver categories