5a-(-4a-3)=21

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Solution for 5a-(-4a-3)=21 equation:


Simplifying
5a + -1(-4a + -3) = 21

Reorder the terms:
5a + -1(-3 + -4a) = 21
5a + (-3 * -1 + -4a * -1) = 21
5a + (3 + 4a) = 21

Reorder the terms:
3 + 5a + 4a = 21

Combine like terms: 5a + 4a = 9a
3 + 9a = 21

Solving
3 + 9a = 21

Solving for variable 'a'.

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

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

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

Combine like terms: 21 + -3 = 18
9a = 18

Divide each side by '9'.
a = 2

Simplifying
a = 2

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