3a-7=20

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Solution for 3a-7=20 equation: 


Simplifying
3a + -7 = 20

Reorder the terms:
-7 + 3a = 20

Solving
-7 + 3a = 20

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 = 20 + 7

Combine like terms: -7 + 7 = 0
0 + 3a = 20 + 7
3a = 20 + 7

Combine like terms: 20 + 7 = 27
3a = 27

Divide each side by '3'.
a = 9

Simplifying
a = 9

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