3a-(a-1)=15

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Solution for 3a-(a-1)=15 equation:


Simplifying
3a + -1(a + -1) = 15

Reorder the terms:
3a + -1(-1 + a) = 15
3a + (-1 * -1 + a * -1) = 15
3a + (1 + -1a) = 15

Reorder the terms:
1 + 3a + -1a = 15

Combine like terms: 3a + -1a = 2a
1 + 2a = 15

Solving
1 + 2a = 15

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 + 2a = 15 + -1

Combine like terms: 1 + -1 = 0
0 + 2a = 15 + -1
2a = 15 + -1

Combine like terms: 15 + -1 = 14
2a = 14

Divide each side by '2'.
a = 7

Simplifying
a = 7

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