8a+4+(20-55-a)=138.2

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Solution for 8a+4+(20-55-a)=138.2 equation:


Simplifying
8a + 4 + (20 + -55 + -1a) = 138.2

Combine like terms: 20 + -55 = -35
8a + 4 + (-35 + -1a) = 138.2

Remove parenthesis around (-35 + -1a)
8a + 4 + -35 + -1a = 138.2

Reorder the terms:
4 + -35 + 8a + -1a = 138.2

Combine like terms: 4 + -35 = -31
-31 + 8a + -1a = 138.2

Combine like terms: 8a + -1a = 7a
-31 + 7a = 138.2

Solving
-31 + 7a = 138.2

Solving for variable 'a'.

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

Add '31' to each side of the equation.
-31 + 31 + 7a = 138.2 + 31

Combine like terms: -31 + 31 = 0
0 + 7a = 138.2 + 31
7a = 138.2 + 31

Combine like terms: 138.2 + 31 = 169.2
7a = 169.2

Divide each side by '7'.
a = 24.17142857

Simplifying
a = 24.17142857

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