7a-33-4a=21

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Solution for 7a-33-4a=21 equation:


Simplifying
7a + -33 + -4a = 21

Reorder the terms:
-33 + 7a + -4a = 21

Combine like terms: 7a + -4a = 3a
-33 + 3a = 21

Solving
-33 + 3a = 21

Solving for variable 'a'.

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

Add '33' to each side of the equation.
-33 + 33 + 3a = 21 + 33

Combine like terms: -33 + 33 = 0
0 + 3a = 21 + 33
3a = 21 + 33

Combine like terms: 21 + 33 = 54
3a = 54

Divide each side by '3'.
a = 18

Simplifying
a = 18

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