87a-90a=100

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Solution for 87a-90a=100 equation: 


Simplifying
87a + -90a = 100

Combine like terms: 87a + -90a = -3a
-3a = 100

Solving
-3a = 100

Solving for variable 'a'.

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

Divide each side by '-3'.
a = -33.33333333

Simplifying
a = -33.33333333

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