3a-1=a+7

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Solution for 3a-1=a+7 equation:


Simplifying
3a + -1 = a + 7

Reorder the terms:
-1 + 3a = a + 7

Reorder the terms:
-1 + 3a = 7 + a

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

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

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

Add '1' to each side of the equation.
-1 + 1 + 2a = 7 + 1

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

Combine like terms: 7 + 1 = 8
2a = 8

Divide each side by '2'.
a = 4

Simplifying
a = 4

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