5.1-4.2=H

Solution for 5.1-4.2=H equation:

Simplifying
5.1 + -4.2 = H

Combine like terms: 5.1 + -4.2 = 0.9
0.9 = H

Solving
0.9 = H

Solving for variable 'H'.

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

Add '-1H' to each side of the equation.
0.9 + -1H = H + -1H

Combine like terms: H + -1H = 0
0.9 + -1H = 0

Add '-0.9' to each side of the equation.
0.9 + -0.9 + -1H = 0 + -0.9

Combine like terms: 0.9 + -0.9 = 0.0
0.0 + -1H = 0 + -0.9
-1H = 0 + -0.9

Combine like terms: 0 + -0.9 = -0.9
-1H = -0.9

Divide each side by '-1'.
H = 0.9

Simplifying
H = 0.9