7b-21=6b+18

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Solution for 7b-21=6b+18 equation:


Simplifying
7b + -21 = 6b + 18

Reorder the terms:
-21 + 7b = 6b + 18

Reorder the terms:
-21 + 7b = 18 + 6b

Solving
-21 + 7b = 18 + 6b

Solving for variable 'b'.

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

Add '-6b' to each side of the equation.
-21 + 7b + -6b = 18 + 6b + -6b

Combine like terms: 7b + -6b = 1b
-21 + 1b = 18 + 6b + -6b

Combine like terms: 6b + -6b = 0
-21 + 1b = 18 + 0
-21 + 1b = 18

Add '21' to each side of the equation.
-21 + 21 + 1b = 18 + 21

Combine like terms: -21 + 21 = 0
0 + 1b = 18 + 21
1b = 18 + 21

Combine like terms: 18 + 21 = 39
1b = 39

Divide each side by '1'.
b = 39

Simplifying
b = 39

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