a+3b=-4

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Solution for a+3b=-4 equation: 


Simplifying
a + 3b = -4

Solving
a + 3b = -4

Solving for variable 'a'.

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

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

Combine like terms: 3b + -3b = 0
a + 0 = -4 + -3b
a = -4 + -3b

Simplifying
a = -4 + -3b

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