-15-a=-7(a-3)

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


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

Reorder the terms:
-15 + -1a = -7(-3 + a)
-15 + -1a = (-3 * -7 + a * -7)
-15 + -1a = (21 + -7a)

Solving
-15 + -1a = 21 + -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.
-15 + -1a + 7a = 21 + -7a + 7a

Combine like terms: -1a + 7a = 6a
-15 + 6a = 21 + -7a + 7a

Combine like terms: -7a + 7a = 0
-15 + 6a = 21 + 0
-15 + 6a = 21

Add '15' to each side of the equation.
-15 + 15 + 6a = 21 + 15

Combine like terms: -15 + 15 = 0
0 + 6a = 21 + 15
6a = 21 + 15

Combine like terms: 21 + 15 = 36
6a = 36

Divide each side by '6'.
a = 6

Simplifying
a = 6

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