6a-30=3a+21

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Solution for 6a-30=3a+21 equation:


Simplifying
6a + -30 = 3a + 21

Reorder the terms:
-30 + 6a = 3a + 21

Reorder the terms:
-30 + 6a = 21 + 3a

Solving
-30 + 6a = 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.
-30 + 6a + -3a = 21 + 3a + -3a

Combine like terms: 6a + -3a = 3a
-30 + 3a = 21 + 3a + -3a

Combine like terms: 3a + -3a = 0
-30 + 3a = 21 + 0
-30 + 3a = 21

Add '30' to each side of the equation.
-30 + 30 + 3a = 21 + 30

Combine like terms: -30 + 30 = 0
0 + 3a = 21 + 30
3a = 21 + 30

Combine like terms: 21 + 30 = 51
3a = 51

Divide each side by '3'.
a = 17

Simplifying
a = 17

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