7a-(a-3)=15

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Solution for 7a-(a-3)=15 equation:


Simplifying
7a + -1(a + -3) = 15

Reorder the terms:
7a + -1(-3 + a) = 15
7a + (-3 * -1 + a * -1) = 15
7a + (3 + -1a) = 15

Reorder the terms:
3 + 7a + -1a = 15

Combine like terms: 7a + -1a = 6a
3 + 6a = 15

Solving
3 + 6a = 15

Solving for variable 'a'.

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

Add '-3' to each side of the equation.
3 + -3 + 6a = 15 + -3

Combine like terms: 3 + -3 = 0
0 + 6a = 15 + -3
6a = 15 + -3

Combine like terms: 15 + -3 = 12
6a = 12

Divide each side by '6'.
a = 2

Simplifying
a = 2

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