-2a+21+5a=3a-7a

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Solution for -2a+21+5a=3a-7a equation:


Simplifying
-2a + 21 + 5a = 3a + -7a

Reorder the terms:
21 + -2a + 5a = 3a + -7a

Combine like terms: -2a + 5a = 3a
21 + 3a = 3a + -7a

Combine like terms: 3a + -7a = -4a
21 + 3a = -4a

Solving
21 + 3a = -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.
21 + 3a + 4a = -4a + 4a

Combine like terms: 3a + 4a = 7a
21 + 7a = -4a + 4a

Combine like terms: -4a + 4a = 0
21 + 7a = 0

Add '-21' to each side of the equation.
21 + -21 + 7a = 0 + -21

Combine like terms: 21 + -21 = 0
0 + 7a = 0 + -21
7a = 0 + -21

Combine like terms: 0 + -21 = -21
7a = -21

Divide each side by '7'.
a = -3

Simplifying
a = -3

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