2a=15.9-8.7-3a

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Solution for 2a=15.9-8.7-3a equation: 


Simplifying
2a = 15.9 + -8.7 + -3a

Combine like terms: 15.9 + -8.7 = 7.2
2a = 7.2 + -3a

Solving
2a = 7.2 + -3a

Solving for variable 'a'.

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

Add '3a' to each side of the equation.
2a + 3a = 7.2 + -3a + 3a

Combine like terms: 2a + 3a = 5a
5a = 7.2 + -3a + 3a

Combine like terms: -3a + 3a = 0
5a = 7.2 + 0
5a = 7.2

Divide each side by '5'.
a = 1.44

Simplifying
a = 1.44

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