3(a-3)=45

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Solution for 3(a-3)=45 equation: 


Simplifying
3(a + -3) = 45

Reorder the terms:
3(-3 + a) = 45
(-3 * 3 + a * 3) = 45
(-9 + 3a) = 45

Solving
-9 + 3a = 45

Solving for variable 'a'.

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

Add '9' to each side of the equation.
-9 + 9 + 3a = 45 + 9

Combine like terms: -9 + 9 = 0
0 + 3a = 45 + 9
3a = 45 + 9

Combine like terms: 45 + 9 = 54
3a = 54

Divide each side by '3'.
a = 18

Simplifying
a = 18

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