7a+21=4(a-4)

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Solution for 7a+21=4(a-4) equation:


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

Reorder the terms:
21 + 7a = 4(a + -4)

Reorder the terms:
21 + 7a = 4(-4 + a)
21 + 7a = (-4 * 4 + a * 4)
21 + 7a = (-16 + 4a)

Solving
21 + 7a = -16 + 4a

Solving for variable 'a'.

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

Add '-4a' to each side of the equation.
21 + 7a + -4a = -16 + 4a + -4a

Combine like terms: 7a + -4a = 3a
21 + 3a = -16 + 4a + -4a

Combine like terms: 4a + -4a = 0
21 + 3a = -16 + 0
21 + 3a = -16

Add '-21' to each side of the equation.
21 + -21 + 3a = -16 + -21

Combine like terms: 21 + -21 = 0
0 + 3a = -16 + -21
3a = -16 + -21

Combine like terms: -16 + -21 = -37
3a = -37

Divide each side by '3'.
a = -12.33333333

Simplifying
a = -12.33333333

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