3(2a-7)=a+9

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


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

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

Reorder the terms:
-21 + 6a = 9 + a

Solving
-21 + 6a = 9 + a

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
-21 + 6a + -1a = 9 + a + -1a

Combine like terms: 6a + -1a = 5a
-21 + 5a = 9 + a + -1a

Combine like terms: a + -1a = 0
-21 + 5a = 9 + 0
-21 + 5a = 9

Add '21' to each side of the equation.
-21 + 21 + 5a = 9 + 21

Combine like terms: -21 + 21 = 0
0 + 5a = 9 + 21
5a = 9 + 21

Combine like terms: 9 + 21 = 30
5a = 30

Divide each side by '5'.
a = 6

Simplifying
a = 6

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