-3[5-7b]=21

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Solution for -3[5-7b]=21 equation: 


Simplifying
-3[5 + -7b] = 21
[5 * -3 + -7b * -3] = 21
[-15 + 21b] = 21

Solving
-15 + 21b = 21

Solving for variable 'b'.

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

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

Combine like terms: -15 + 15 = 0
0 + 21b = 21 + 15
21b = 21 + 15

Combine like terms: 21 + 15 = 36
21b = 36

Divide each side by '21'.
b = 1.714285714

Simplifying
b = 1.714285714

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