3-4a=-a-18

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Solution for 3-4a=-a-18 equation:


Simplifying
3 + -4a = -1a + -18

Reorder the terms:
3 + -4a = -18 + -1a

Solving
3 + -4a = -18 + -1a

Solving for variable 'a'.

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

Add 'a' to each side of the equation.
3 + -4a + a = -18 + -1a + a

Combine like terms: -4a + a = -3a
3 + -3a = -18 + -1a + a

Combine like terms: -1a + a = 0
3 + -3a = -18 + 0
3 + -3a = -18

Add '-3' to each side of the equation.
3 + -3 + -3a = -18 + -3

Combine like terms: 3 + -3 = 0
0 + -3a = -18 + -3
-3a = -18 + -3

Combine like terms: -18 + -3 = -21
-3a = -21

Divide each side by '-3'.
a = 7

Simplifying
a = 7

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