4.2-1.8a=2.5a

Solution for 4.2-1.8a=2.5a equation:

Simplifying
4.2 + -1.8a = 2.5a

Solving
4.2 + -1.8a = 2.5a

Solving for variable 'a'.

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

Add '-2.5a' to each side of the equation.
4.2 + -1.8a + -2.5a = 2.5a + -2.5a

Combine like terms: -1.8a + -2.5a = -4.3a
4.2 + -4.3a = 2.5a + -2.5a

Combine like terms: 2.5a + -2.5a = 0.0
4.2 + -4.3a = 0.0

Add '-4.2' to each side of the equation.
4.2 + -4.2 + -4.3a = 0.0 + -4.2

Combine like terms: 4.2 + -4.2 = 0.0
0.0 + -4.3a = 0.0 + -4.2
-4.3a = 0.0 + -4.2

Combine like terms: 0.0 + -4.2 = -4.2
-4.3a = -4.2

Divide each side by '-4.3'.
a = 0.976744186

Simplifying
a = 0.976744186