5a-(2a-1)=21

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Solution for 5a-(2a-1)=21 equation:


Simplifying
5a + -1(2a + -1) = 21

Reorder the terms:
5a + -1(-1 + 2a) = 21
5a + (-1 * -1 + 2a * -1) = 21
5a + (1 + -2a) = 21

Reorder the terms:
1 + 5a + -2a = 21

Combine like terms: 5a + -2a = 3a
1 + 3a = 21

Solving
1 + 3a = 21

Solving for variable 'a'.

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

Add '-1' to each side of the equation.
1 + -1 + 3a = 21 + -1

Combine like terms: 1 + -1 = 0
0 + 3a = 21 + -1
3a = 21 + -1

Combine like terms: 21 + -1 = 20
3a = 20

Divide each side by '3'.
a = 6.666666667

Simplifying
a = 6.666666667

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