3a+7=21

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Solution for 3a+7=21 equation: 


Simplifying
3a + 7 = 21

Reorder the terms:
7 + 3a = 21

Solving
7 + 3a = 21

Solving for variable 'a'.

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

Add '-7' to each side of the equation.
7 + -7 + 3a = 21 + -7

Combine like terms: 7 + -7 = 0
0 + 3a = 21 + -7
3a = 21 + -7

Combine like terms: 21 + -7 = 14
3a = 14

Divide each side by '3'.
a = 4.666666667

Simplifying
a = 4.666666667

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