-21=7-2a

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Solution for -21=7-2a equation:


Simplifying
-21 = 7 + -2a

Solving
-21 = 7 + -2a

Solving for variable 'a'.

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

Add '2a' to each side of the equation.
-21 + 2a = 7 + -2a + 2a

Combine like terms: -2a + 2a = 0
-21 + 2a = 7 + 0
-21 + 2a = 7

Add '21' to each side of the equation.
-21 + 21 + 2a = 7 + 21

Combine like terms: -21 + 21 = 0
0 + 2a = 7 + 21
2a = 7 + 21

Combine like terms: 7 + 21 = 28
2a = 28

Divide each side by '2'.
a = 14

Simplifying
a = 14

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