3a+5=a-7

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Solution for 3a+5=a-7 equation:


Simplifying
3a + 5 = a + -7

Reorder the terms:
5 + 3a = a + -7

Reorder the terms:
5 + 3a = -7 + a

Solving
5 + 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.
5 + 3a + -1a = -7 + a + -1a

Combine like terms: 3a + -1a = 2a
5 + 2a = -7 + a + -1a

Combine like terms: a + -1a = 0
5 + 2a = -7 + 0
5 + 2a = -7

Add '-5' to each side of the equation.
5 + -5 + 2a = -7 + -5

Combine like terms: 5 + -5 = 0
0 + 2a = -7 + -5
2a = -7 + -5

Combine like terms: -7 + -5 = -12
2a = -12

Divide each side by '2'.
a = -6

Simplifying
a = -6

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