21-6a=4a-4(a+3)

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Solution for 21-6a=4a-4(a+3) equation:


Simplifying
21 + -6a = 4a + -4(a + 3)

Reorder the terms:
21 + -6a = 4a + -4(3 + a)
21 + -6a = 4a + (3 * -4 + a * -4)
21 + -6a = 4a + (-12 + -4a)

Reorder the terms:
21 + -6a = -12 + 4a + -4a

Combine like terms: 4a + -4a = 0
21 + -6a = -12 + 0
21 + -6a = -12

Solving
21 + -6a = -12

Solving for variable 'a'.

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

Add '-21' to each side of the equation.
21 + -21 + -6a = -12 + -21

Combine like terms: 21 + -21 = 0
0 + -6a = -12 + -21
-6a = -12 + -21

Combine like terms: -12 + -21 = -33
-6a = -33

Divide each side by '-6'.
a = 5.5

Simplifying
a = 5.5

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