12a+75a+21=630

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Solution for 12a+75a+21=630 equation:


Simplifying
12a + 75a + 21 = 630

Reorder the terms:
21 + 12a + 75a = 630

Combine like terms: 12a + 75a = 87a
21 + 87a = 630

Solving
21 + 87a = 630

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 + 87a = 630 + -21

Combine like terms: 21 + -21 = 0
0 + 87a = 630 + -21
87a = 630 + -21

Combine like terms: 630 + -21 = 609
87a = 609

Divide each side by '87'.
a = 7

Simplifying
a = 7

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