a-3b=13

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Solution for a-3b=13 equation: 


Simplifying
a + -3b = 13

Solving
a + -3b = 13

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 = 13 + 3b

Combine like terms: -3b + 3b = 0
a + 0 = 13 + 3b
a = 13 + 3b

Simplifying
a = 13 + 3b

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