3a-90=45

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Solution for 3a-90=45 equation: 


Simplifying
3a + -90 = 45

Reorder the terms:
-90 + 3a = 45

Solving
-90 + 3a = 45

Solving for variable 'a'.

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

Add '90' to each side of the equation.
-90 + 90 + 3a = 45 + 90

Combine like terms: -90 + 90 = 0
0 + 3a = 45 + 90
3a = 45 + 90

Combine like terms: 45 + 90 = 135
3a = 135

Divide each side by '3'.
a = 45

Simplifying
a = 45

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