-3[b-(-7)]=

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Solution for -3[b-(-7)]= equation:


Simplifying
-3[b + -1(-7)] = 0

Multiply -1 * -7
-3[b + 7] = 0

Reorder the terms:
-3[7 + b] = 0
[7 * -3 + b * -3] = 0
[-21 + -3b] = 0

Solving
-21 + -3b = 0

Solving for variable 'b'.

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

Add '21' to each side of the equation.
-21 + 21 + -3b = 0 + 21

Combine like terms: -21 + 21 = 0
0 + -3b = 0 + 21
-3b = 0 + 21

Combine like terms: 0 + 21 = 21
-3b = 21

Divide each side by '-3'.
b = -7

Simplifying
b = -7

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