20a-7+5a-13=55

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Solution for 20a-7+5a-13=55 equation:


Simplifying
20a + -7 + 5a + -13 = 55

Reorder the terms:
-7 + -13 + 20a + 5a = 55

Combine like terms: -7 + -13 = -20
-20 + 20a + 5a = 55

Combine like terms: 20a + 5a = 25a
-20 + 25a = 55

Solving
-20 + 25a = 55

Solving for variable 'a'.

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

Add '20' to each side of the equation.
-20 + 20 + 25a = 55 + 20

Combine like terms: -20 + 20 = 0
0 + 25a = 55 + 20
25a = 55 + 20

Combine like terms: 55 + 20 = 75
25a = 75

Divide each side by '25'.
a = 3

Simplifying
a = 3

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