7(a-3)=4a+9

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


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

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

Reorder the terms:
-21 + 7a = 9 + 4a

Solving
-21 + 7a = 9 + 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 = 9 + 4a + -4a

Combine like terms: 7a + -4a = 3a
-21 + 3a = 9 + 4a + -4a

Combine like terms: 4a + -4a = 0
-21 + 3a = 9 + 0
-21 + 3a = 9

Add '21' to each side of the equation.
-21 + 21 + 3a = 9 + 21

Combine like terms: -21 + 21 = 0
0 + 3a = 9 + 21
3a = 9 + 21

Combine like terms: 9 + 21 = 30
3a = 30

Divide each side by '3'.
a = 10

Simplifying
a = 10

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