5a-(18+a)=6+3a-21

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Solution for 5a-(18+a)=6+3a-21 equation:


Simplifying
5a + -1(18 + a) = 6 + 3a + -21
5a + (18 * -1 + a * -1) = 6 + 3a + -21
5a + (-18 + -1a) = 6 + 3a + -21

Reorder the terms:
-18 + 5a + -1a = 6 + 3a + -21

Combine like terms: 5a + -1a = 4a
-18 + 4a = 6 + 3a + -21

Reorder the terms:
-18 + 4a = 6 + -21 + 3a

Combine like terms: 6 + -21 = -15
-18 + 4a = -15 + 3a

Solving
-18 + 4a = -15 + 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.
-18 + 4a + -3a = -15 + 3a + -3a

Combine like terms: 4a + -3a = 1a
-18 + 1a = -15 + 3a + -3a

Combine like terms: 3a + -3a = 0
-18 + 1a = -15 + 0
-18 + 1a = -15

Add '18' to each side of the equation.
-18 + 18 + 1a = -15 + 18

Combine like terms: -18 + 18 = 0
0 + 1a = -15 + 18
1a = -15 + 18

Combine like terms: -15 + 18 = 3
1a = 3

Divide each side by '1'.
a = 3

Simplifying
a = 3

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