120-84=2a+5a-4a

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Solution for 120-84=2a+5a-4a equation:


Simplifying
120 + -84 = 2a + 5a + -4a

Combine like terms: 120 + -84 = 36
36 = 2a + 5a + -4a

Combine like terms: 2a + 5a = 7a
36 = 7a + -4a

Combine like terms: 7a + -4a = 3a
36 = 3a

Solving
36 = 3a

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.
36 + -3a = 3a + -3a

Combine like terms: 3a + -3a = 0
36 + -3a = 0

Add '-36' to each side of the equation.
36 + -36 + -3a = 0 + -36

Combine like terms: 36 + -36 = 0
0 + -3a = 0 + -36
-3a = 0 + -36

Combine like terms: 0 + -36 = -36
-3a = -36

Divide each side by '-3'.
a = 12

Simplifying
a = 12

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