2h+h-7h+4.2=5.4

Solution for 2h+h-7h+4.2=5.4 equation:

Simplifying
2h + h + -7h + 4.2 = 5.4

Reorder the terms:
4.2 + 2h + h + -7h = 5.4

Combine like terms: 2h + h = 3h
4.2 + 3h + -7h = 5.4

Combine like terms: 3h + -7h = -4h
4.2 + -4h = 5.4

Solving
4.2 + -4h = 5.4

Solving for variable 'h'.

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

Add '-4.2' to each side of the equation.
4.2 + -4.2 + -4h = 5.4 + -4.2

Combine like terms: 4.2 + -4.2 = 0.0
0.0 + -4h = 5.4 + -4.2
-4h = 5.4 + -4.2

Combine like terms: 5.4 + -4.2 = 1.2
-4h = 1.2

Divide each side by '-4'.
h = -0.3

Simplifying
h = -0.3