5*21=7(3w)

Solution for 5*21=7(3w) equation:

Simplifying
5 * 21 = 7(3w)

Multiply 5 * 21
105 = 7(3w)

Remove parenthesis around (3w)
105 = 7 * 3w

Multiply 7 * 3
105 = 21w

Solving
105 = 21w

Solving for variable 'w'.

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

Add '-21w' to each side of the equation.
105 + -21w = 21w + -21w

Combine like terms: 21w + -21w = 0
105 + -21w = 0

Add '-105' to each side of the equation.
105 + -105 + -21w = 0 + -105

Combine like terms: 105 + -105 = 0
0 + -21w = 0 + -105
-21w = 0 + -105

Combine like terms: 0 + -105 = -105
-21w = -105

Divide each side by '-21'.
w = 5

Simplifying
w = 5