-21=7+6(b+9)

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Solution for -21=7+6(b+9) equation:


Simplifying
-21 = 7 + 6(b + 9)

Reorder the terms:
-21 = 7 + 6(9 + b)
-21 = 7 + (9 * 6 + b * 6)
-21 = 7 + (54 + 6b)

Combine like terms: 7 + 54 = 61
-21 = 61 + 6b

Solving
-21 = 61 + 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 = 61 + 6b + -6b

Combine like terms: 6b + -6b = 0
-21 + -6b = 61 + 0
-21 + -6b = 61

Add '21' to each side of the equation.
-21 + 21 + -6b = 61 + 21

Combine like terms: -21 + 21 = 0
0 + -6b = 61 + 21
-6b = 61 + 21

Combine like terms: 61 + 21 = 82
-6b = 82

Divide each side by '-6'.
b = -13.66666667

Simplifying
b = -13.66666667

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