4.2-1=x

Solution for 4.2-1=x equation:

Simplifying
4.2 + -1 = x

Combine like terms: 4.2 + -1 = 3.2
3.2 = x

Solving
3.2 = x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
3.2 + -1x = x + -1x

Combine like terms: x + -1x = 0
3.2 + -1x = 0

Add '-3.2' to each side of the equation.
3.2 + -3.2 + -1x = 0 + -3.2

Combine like terms: 3.2 + -3.2 = 0.0
0.0 + -1x = 0 + -3.2
-1x = 0 + -3.2

Combine like terms: 0 + -3.2 = -3.2
-1x = -3.2

Divide each side by '-1'.
x = 3.2

Simplifying
x = 3.2