3a+9=4a-1

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Solution for 3a+9=4a-1 equation:


Simplifying
3a + 9 = 4a + -1

Reorder the terms:
9 + 3a = 4a + -1

Reorder the terms:
9 + 3a = -1 + 4a

Solving
9 + 3a = -1 + 4a

Solving for variable 'a'.

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

Add '-4a' to each side of the equation.
9 + 3a + -4a = -1 + 4a + -4a

Combine like terms: 3a + -4a = -1a
9 + -1a = -1 + 4a + -4a

Combine like terms: 4a + -4a = 0
9 + -1a = -1 + 0
9 + -1a = -1

Add '-9' to each side of the equation.
9 + -9 + -1a = -1 + -9

Combine like terms: 9 + -9 = 0
0 + -1a = -1 + -9
-1a = -1 + -9

Combine like terms: -1 + -9 = -10
-1a = -10

Divide each side by '-1'.
a = 10

Simplifying
a = 10

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