21=3(4-2b)

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Solution for 21=3(4-2b) equation:


Simplifying
21 = 3(4 + -2b)
21 = (4 * 3 + -2b * 3)
21 = (12 + -6b)

Solving
21 = 12 + -6b

Solving for variable 'b'.

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

Add '6b' to each side of the equation.
21 + 6b = 12 + -6b + 6b

Combine like terms: -6b + 6b = 0
21 + 6b = 12 + 0
21 + 6b = 12

Add '-21' to each side of the equation.
21 + -21 + 6b = 12 + -21

Combine like terms: 21 + -21 = 0
0 + 6b = 12 + -21
6b = 12 + -21

Combine like terms: 12 + -21 = -9
6b = -9

Divide each side by '6'.
b = -1.5

Simplifying
b = -1.5

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