7m+mn+21+3b=

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Solution for 7m+mn+21+3b= equation:


Simplifying
7m + mn + 21 + 3b = 0

Reorder the terms:
21 + 3b + 7m + mn = 0

Solving
21 + 3b + 7m + mn = 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 + 3b + 7m + -21 + mn = 0 + -21

Reorder the terms:
21 + -21 + 3b + 7m + mn = 0 + -21

Combine like terms: 21 + -21 = 0
0 + 3b + 7m + mn = 0 + -21
3b + 7m + mn = 0 + -21

Combine like terms: 0 + -21 = -21
3b + 7m + mn = -21

Add '-7m' to each side of the equation.
3b + 7m + -7m + mn = -21 + -7m

Combine like terms: 7m + -7m = 0
3b + 0 + mn = -21 + -7m
3b + mn = -21 + -7m

Add '-1mn' to each side of the equation.
3b + mn + -1mn = -21 + -7m + -1mn

Combine like terms: mn + -1mn = 0
3b + 0 = -21 + -7m + -1mn
3b = -21 + -7m + -1mn

Divide each side by '3'.
b = -7 + -2.333333333m + -0.3333333333mn

Simplifying
b = -7 + -2.333333333m + -0.3333333333mn

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