3a-12b-21c=

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Solution for 3a-12b-21c= equation:


Simplifying
3a + -12b + -21c = 0

Solving
3a + -12b + -21c = 0

Solving for variable 'a'.

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

Add '12b' to each side of the equation.
3a + -12b + 12b + -21c = 0 + 12b

Combine like terms: -12b + 12b = 0
3a + 0 + -21c = 0 + 12b
3a + -21c = 0 + 12b
Remove the zero:
3a + -21c = 12b

Add '21c' to each side of the equation.
3a + -21c + 21c = 12b + 21c

Combine like terms: -21c + 21c = 0
3a + 0 = 12b + 21c
3a = 12b + 21c

Divide each side by '3'.
a = 4b + 7c

Simplifying
a = 4b + 7c

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