17=21-4a

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Solution for 17=21-4a equation:


Simplifying
17 = 21 + -4a

Solving
17 = 21 + -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.
17 + 4a = 21 + -4a + 4a

Combine like terms: -4a + 4a = 0
17 + 4a = 21 + 0
17 + 4a = 21

Add '-17' to each side of the equation.
17 + -17 + 4a = 21 + -17

Combine like terms: 17 + -17 = 0
0 + 4a = 21 + -17
4a = 21 + -17

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

Divide each side by '4'.
a = 1

Simplifying
a = 1

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