3a+20=4a+5

Solution for 3a+20=4a+5 equation:

Simplifying
3a + 20 = 4a + 5

Reorder the terms:
20 + 3a = 4a + 5

Reorder the terms:
20 + 3a = 5 + 4a

Solving
20 + 3a = 5 + 4a

Solving for variable 'a'.

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

Add '-4a' to each side of the equation.
20 + 3a + -4a = 5 + 4a + -4a

Combine like terms: 3a + -4a = -1a
20 + -1a = 5 + 4a + -4a

Combine like terms: 4a + -4a = 0
20 + -1a = 5 + 0
20 + -1a = 5

Add '-20' to each side of the equation.
20 + -20 + -1a = 5 + -20

Combine like terms: 20 + -20 = 0
0 + -1a = 5 + -20
-1a = 5 + -20

Combine like terms: 5 + -20 = -15
-1a = -15

Divide each side by '-1'.
a = 15

Simplifying
a = 15