20=8+a*4

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Solution for 20=8+a*4 equation:


Simplifying
20 = 8 + a * 4

Reorder the terms for easier multiplication:
20 = 8 + 4a

Solving
20 = 8 + 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.
20 + -4a = 8 + 4a + -4a

Combine like terms: 4a + -4a = 0
20 + -4a = 8 + 0
20 + -4a = 8

Add '-20' to each side of the equation.
20 + -20 + -4a = 8 + -20

Combine like terms: 20 + -20 = 0
0 + -4a = 8 + -20
-4a = 8 + -20

Combine like terms: 8 + -20 = -12
-4a = -12

Divide each side by '-4'.
a = 3

Simplifying
a = 3

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