3b+21-4b=4b+12-4b

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Solution for 3b+21-4b=4b+12-4b equation:


Simplifying
3b + 21 + -4b = 4b + 12 + -4b

Reorder the terms:
21 + 3b + -4b = 4b + 12 + -4b

Combine like terms: 3b + -4b = -1b
21 + -1b = 4b + 12 + -4b

Reorder the terms:
21 + -1b = 12 + 4b + -4b

Combine like terms: 4b + -4b = 0
21 + -1b = 12 + 0
21 + -1b = 12

Solving
21 + -1b = 12

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 + -1b = 12 + -21

Combine like terms: 21 + -21 = 0
0 + -1b = 12 + -21
-1b = 12 + -21

Combine like terms: 12 + -21 = -9
-1b = -9

Divide each side by '-1'.
b = 9

Simplifying
b = 9

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