7b-21=2b+4

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Solution for 7b-21=2b+4 equation:


Simplifying
7b + -21 = 2b + 4

Reorder the terms:
-21 + 7b = 2b + 4

Reorder the terms:
-21 + 7b = 4 + 2b

Solving
-21 + 7b = 4 + 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.
-21 + 7b + -2b = 4 + 2b + -2b

Combine like terms: 7b + -2b = 5b
-21 + 5b = 4 + 2b + -2b

Combine like terms: 2b + -2b = 0
-21 + 5b = 4 + 0
-21 + 5b = 4

Add '21' to each side of the equation.
-21 + 21 + 5b = 4 + 21

Combine like terms: -21 + 21 = 0
0 + 5b = 4 + 21
5b = 4 + 21

Combine like terms: 4 + 21 = 25
5b = 25

Divide each side by '5'.
b = 5

Simplifying
b = 5

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