15a-18a=687

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Solution for 15a-18a=687 equation: 


Simplifying
15a + -18a = 687

Combine like terms: 15a + -18a = -3a
-3a = 687

Solving
-3a = 687

Solving for variable 'a'.

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

Divide each side by '-3'.
a = -229

Simplifying
a = -229

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