5a-15=3a+21

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Solution for 5a-15=3a+21 equation:


Simplifying
5a + -15 = 3a + 21

Reorder the terms:
-15 + 5a = 3a + 21

Reorder the terms:
-15 + 5a = 21 + 3a

Solving
-15 + 5a = 21 + 3a

Solving for variable 'a'.

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

Add '-3a' to each side of the equation.
-15 + 5a + -3a = 21 + 3a + -3a

Combine like terms: 5a + -3a = 2a
-15 + 2a = 21 + 3a + -3a

Combine like terms: 3a + -3a = 0
-15 + 2a = 21 + 0
-15 + 2a = 21

Add '15' to each side of the equation.
-15 + 15 + 2a = 21 + 15

Combine like terms: -15 + 15 = 0
0 + 2a = 21 + 15
2a = 21 + 15

Combine like terms: 21 + 15 = 36
2a = 36

Divide each side by '2'.
a = 18

Simplifying
a = 18

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