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 = 12
3a = 12

Divide each side by '3'.
a = 4

Simplifying
a = 4

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