20-a=7a-4a+4

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Solution for 20-a=7a-4a+4 equation:


Simplifying
20 + -1a = 7a + -4a + 4

Reorder the terms:
20 + -1a = 4 + 7a + -4a

Combine like terms: 7a + -4a = 3a
20 + -1a = 4 + 3a

Solving
20 + -1a = 4 + 3a

Solving for variable 'a'.

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

Add '-3a' to each side of the equation.
20 + -1a + -3a = 4 + 3a + -3a

Combine like terms: -1a + -3a = -4a
20 + -4a = 4 + 3a + -3a

Combine like terms: 3a + -3a = 0
20 + -4a = 4 + 0
20 + -4a = 4

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

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

Combine like terms: 4 + -20 = -16
-4a = -16

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

Simplifying
a = 4

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