3h+15=7h-21

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Solution for 3h+15=7h-21 equation:


Simplifying
3h + 15 = 7h + -21

Reorder the terms:
15 + 3h = 7h + -21

Reorder the terms:
15 + 3h = -21 + 7h

Solving
15 + 3h = -21 + 7h

Solving for variable 'h'.

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

Add '-7h' to each side of the equation.
15 + 3h + -7h = -21 + 7h + -7h

Combine like terms: 3h + -7h = -4h
15 + -4h = -21 + 7h + -7h

Combine like terms: 7h + -7h = 0
15 + -4h = -21 + 0
15 + -4h = -21

Add '-15' to each side of the equation.
15 + -15 + -4h = -21 + -15

Combine like terms: 15 + -15 = 0
0 + -4h = -21 + -15
-4h = -21 + -15

Combine like terms: -21 + -15 = -36
-4h = -36

Divide each side by '-4'.
h = 9

Simplifying
h = 9

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