5a+87=4a+100

Solution for 5a+87=4a+100 equation:

Simplifying
5a + 87 = 4a + 100

Reorder the terms:
87 + 5a = 4a + 100

Reorder the terms:
87 + 5a = 100 + 4a

Solving
87 + 5a = 100 + 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.
87 + 5a + -4a = 100 + 4a + -4a

Combine like terms: 5a + -4a = 1a
87 + 1a = 100 + 4a + -4a

Combine like terms: 4a + -4a = 0
87 + 1a = 100 + 0
87 + 1a = 100

Add '-87' to each side of the equation.
87 + -87 + 1a = 100 + -87

Combine like terms: 87 + -87 = 0
0 + 1a = 100 + -87
1a = 100 + -87

Combine like terms: 100 + -87 = 13
1a = 13

Divide each side by '1'.
a = 13

Simplifying
a = 13