17-2a=21

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Solution for 17-2a=21 equation: 


Simplifying
17 + -2a = 21

Solving
17 + -2a = 21

Solving for variable 'a'.

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

Add '-17' to each side of the equation.
17 + -17 + -2a = 21 + -17

Combine like terms: 17 + -17 = 0
0 + -2a = 21 + -17
-2a = 21 + -17

Combine like terms: 21 + -17 = 4
-2a = 4

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

Simplifying
a = -2

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