7(3a+6)=9(2a-4)

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Solution for 7(3a+6)=9(2a-4) equation:


Simplifying
7(3a + 6) = 9(2a + -4)

Reorder the terms:
7(6 + 3a) = 9(2a + -4)
(6 * 7 + 3a * 7) = 9(2a + -4)
(42 + 21a) = 9(2a + -4)

Reorder the terms:
42 + 21a = 9(-4 + 2a)
42 + 21a = (-4 * 9 + 2a * 9)
42 + 21a = (-36 + 18a)

Solving
42 + 21a = -36 + 18a

Solving for variable 'a'.

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

Add '-18a' to each side of the equation.
42 + 21a + -18a = -36 + 18a + -18a

Combine like terms: 21a + -18a = 3a
42 + 3a = -36 + 18a + -18a

Combine like terms: 18a + -18a = 0
42 + 3a = -36 + 0
42 + 3a = -36

Add '-42' to each side of the equation.
42 + -42 + 3a = -36 + -42

Combine like terms: 42 + -42 = 0
0 + 3a = -36 + -42
3a = -36 + -42

Combine like terms: -36 + -42 = -78
3a = -78

Divide each side by '3'.
a = -26

Simplifying
a = -26

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