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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