-21=2a-7

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Solution for -21=2a-7 equation:


Simplifying
-21 = 2a + -7

Reorder the terms:
-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 = 14
-2a = 14

Divide each side by '-2'.
a = -7

Simplifying
a = -7

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