21-1=5a-2a+4a

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Solution for 21-1=5a-2a+4a equation:


Simplifying
21 + -1 = 5a + -2a + 4a

Combine like terms: 21 + -1 = 20
20 = 5a + -2a + 4a

Combine like terms: 5a + -2a = 3a
20 = 3a + 4a

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

Solving
20 = 7a

Solving for variable 'a'.

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

Add '-7a' to each side of the equation.
20 + -7a = 7a + -7a

Combine like terms: 7a + -7a = 0
20 + -7a = 0

Add '-20' to each side of the equation.
20 + -20 + -7a = 0 + -20

Combine like terms: 20 + -20 = 0
0 + -7a = 0 + -20
-7a = 0 + -20

Combine like terms: 0 + -20 = -20
-7a = -20

Divide each side by '-7'.
a = 2.857142857

Simplifying
a = 2.857142857

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