12a+21=75

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Solution for 12a+21=75 equation: 


Simplifying
12a + 21 = 75

Reorder the terms:
21 + 12a = 75

Solving
21 + 12a = 75

Solving for variable 'a'.

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

Add '-21' to each side of the equation.
21 + -21 + 12a = 75 + -21

Combine like terms: 21 + -21 = 0
0 + 12a = 75 + -21
12a = 75 + -21

Combine like terms: 75 + -21 = 54
12a = 54

Divide each side by '12'.
a = 4.5

Simplifying
a = 4.5

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