21=2m+3b

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Solution for 21=2m+3b equation:


Simplifying
21 = 2m + 3b

Reorder the terms:
21 = 3b + 2m

Solving
21 = 3b + 2m

Solving for variable 'b'.

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

Add '-3b' to each side of the equation.
21 + -3b = 3b + -3b + 2m

Combine like terms: 3b + -3b = 0
21 + -3b = 0 + 2m
21 + -3b = 2m

Add '-21' to each side of the equation.
21 + -21 + -3b = -21 + 2m

Combine like terms: 21 + -21 = 0
0 + -3b = -21 + 2m
-3b = -21 + 2m

Divide each side by '-3'.
b = 7 + -0.6666666667m

Simplifying
b = 7 + -0.6666666667m

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