21-4b=-7(3b-3)

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Solution for 21-4b=-7(3b-3) equation:


Simplifying
21 + -4b = -7(3b + -3)

Reorder the terms:
21 + -4b = -7(-3 + 3b)
21 + -4b = (-3 * -7 + 3b * -7)
21 + -4b = (21 + -21b)

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

Combine like terms: 21 + -21 = 0
0 + -4b = 21 + -21 + -21b
-4b = 21 + -21 + -21b

Combine like terms: 21 + -21 = 0
-4b = 0 + -21b
-4b = -21b

Solving
-4b = -21b

Solving for variable 'b'.

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

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

Combine like terms: -4b + 21b = 17b
17b = -21b + 21b

Combine like terms: -21b + 21b = 0
17b = 0

Divide each side by '17'.
b = 0

Simplifying
b = 0

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