-15=-a+7

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Solution for -15=-a+7 equation:


Simplifying
-15 = -1a + 7

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

Solving
-15 = 7 + -1a

Solving for variable 'a'.

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

Add 'a' to each side of the equation.
-15 + a = 7 + -1a + a

Combine like terms: -1a + a = 0
-15 + a = 7 + 0
-15 + a = 7

Add '15' to each side of the equation.
-15 + 15 + a = 7 + 15

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

Combine like terms: 7 + 15 = 22
a = 22

Simplifying
a = 22

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