-9a-21=-6(9a-4)

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Solution for -9a-21=-6(9a-4) equation:


Simplifying
-9a + -21 = -6(9a + -4)

Reorder the terms:
-21 + -9a = -6(9a + -4)

Reorder the terms:
-21 + -9a = -6(-4 + 9a)
-21 + -9a = (-4 * -6 + 9a * -6)
-21 + -9a = (24 + -54a)

Solving
-21 + -9a = 24 + -54a

Solving for variable 'a'.

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

Add '54a' to each side of the equation.
-21 + -9a + 54a = 24 + -54a + 54a

Combine like terms: -9a + 54a = 45a
-21 + 45a = 24 + -54a + 54a

Combine like terms: -54a + 54a = 0
-21 + 45a = 24 + 0
-21 + 45a = 24

Add '21' to each side of the equation.
-21 + 21 + 45a = 24 + 21

Combine like terms: -21 + 21 = 0
0 + 45a = 24 + 21
45a = 24 + 21

Combine like terms: 24 + 21 = 45
45a = 45

Divide each side by '45'.
a = 1

Simplifying
a = 1

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