3a+15+2a=-4a-21

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Solution for 3a+15+2a=-4a-21 equation:


Simplifying
3a + 15 + 2a = -4a + -21

Reorder the terms:
15 + 3a + 2a = -4a + -21

Combine like terms: 3a + 2a = 5a
15 + 5a = -4a + -21

Reorder the terms:
15 + 5a = -21 + -4a

Solving
15 + 5a = -21 + -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.
15 + 5a + 4a = -21 + -4a + 4a

Combine like terms: 5a + 4a = 9a
15 + 9a = -21 + -4a + 4a

Combine like terms: -4a + 4a = 0
15 + 9a = -21 + 0
15 + 9a = -21

Add '-15' to each side of the equation.
15 + -15 + 9a = -21 + -15

Combine like terms: 15 + -15 = 0
0 + 9a = -21 + -15
9a = -21 + -15

Combine like terms: -21 + -15 = -36
9a = -36

Divide each side by '9'.
a = -4

Simplifying
a = -4

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