2a-4+b=20

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Solution for 2a-4+b=20 equation:


Simplifying
2a + -4 + b = 20

Reorder the terms:
-4 + 2a + b = 20

Solving
-4 + 2a + b = 20

Solving for variable 'a'.

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

Add '4' to each side of the equation.
-4 + 2a + 4 + b = 20 + 4

Reorder the terms:
-4 + 4 + 2a + b = 20 + 4

Combine like terms: -4 + 4 = 0
0 + 2a + b = 20 + 4
2a + b = 20 + 4

Combine like terms: 20 + 4 = 24
2a + b = 24

Add '-1b' to each side of the equation.
2a + b + -1b = 24 + -1b

Combine like terms: b + -1b = 0
2a + 0 = 24 + -1b
2a = 24 + -1b

Divide each side by '2'.
a = 12 + -0.5b

Simplifying
a = 12 + -0.5b

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