15a-13a=4

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Solution for 15a-13a=4 equation: 


Simplifying
15a + -13a = 4

Combine like terms: 15a + -13a = 2a
2a = 4

Solving
2a = 4

Solving for variable 'a'.

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

Divide each side by '2'.
a = 2

Simplifying
a = 2

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