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

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


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

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

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

Combine like terms: 7a + -3a = 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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