3a+15=a+7

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Solution for 3a+15=a+7 equation:


Simplifying
3a + 15 = a + 7

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

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

Solving
15 + 3a = 7 + a

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
15 + 3a + -1a = 7 + a + -1a

Combine like terms: 3a + -1a = 2a
15 + 2a = 7 + a + -1a

Combine like terms: a + -1a = 0
15 + 2a = 7 + 0
15 + 2a = 7

Add '-15' to each side of the equation.
15 + -15 + 2a = 7 + -15

Combine like terms: 15 + -15 = 0
0 + 2a = 7 + -15
2a = 7 + -15

Combine like terms: 7 + -15 = -8
2a = -8

Divide each side by '2'.
a = -4

Simplifying
a = -4

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