7(12-3h)=42

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Solution for 7(12-3h)=42 equation: 


Simplifying
7(12 + -3h) = 42
(12 * 7 + -3h * 7) = 42
(84 + -21h) = 42

Solving
84 + -21h = 42

Solving for variable 'h'.

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

Add '-84' to each side of the equation.
84 + -84 + -21h = 42 + -84

Combine like terms: 84 + -84 = 0
0 + -21h = 42 + -84
-21h = 42 + -84

Combine like terms: 42 + -84 = -42
-21h = -42

Divide each side by '-21'.
h = 2

Simplifying
h = 2

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