3b-4=2b+21

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Solution for 3b-4=2b+21 equation:


Simplifying
3b + -4 = 2b + 21

Reorder the terms:
-4 + 3b = 2b + 21

Reorder the terms:
-4 + 3b = 21 + 2b

Solving
-4 + 3b = 21 + 2b

Solving for variable 'b'.

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

Add '-2b' to each side of the equation.
-4 + 3b + -2b = 21 + 2b + -2b

Combine like terms: 3b + -2b = 1b
-4 + 1b = 21 + 2b + -2b

Combine like terms: 2b + -2b = 0
-4 + 1b = 21 + 0
-4 + 1b = 21

Add '4' to each side of the equation.
-4 + 4 + 1b = 21 + 4

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

Combine like terms: 21 + 4 = 25
1b = 25

Divide each side by '1'.
b = 25

Simplifying
b = 25

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