21=3a+2b

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Solution for 21=3a+2b equation:


Simplifying
21 = 3a + 2b

Solving
21 = 3a + 2b

Solving for variable 'a'.

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

Add '-3a' to each side of the equation.
21 + -3a = 3a + -3a + 2b

Combine like terms: 3a + -3a = 0
21 + -3a = 0 + 2b
21 + -3a = 2b

Add '-21' to each side of the equation.
21 + -21 + -3a = -21 + 2b

Combine like terms: 21 + -21 = 0
0 + -3a = -21 + 2b
-3a = -21 + 2b

Divide each side by '-3'.
a = 7 + -0.6666666667b

Simplifying
a = 7 + -0.6666666667b

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