a+15=7+3*a

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


Simplifying
a + 15 = 7 + 3a

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

Solving
15 + a = 7 + 3a

Solving for variable 'a'.

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

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

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

Combine like terms: 3a + -3a = 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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