6b+18=7b-21

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


Simplifying
6b + 18 = 7b + -21

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

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

Solving
18 + 6b = -21 + 7b

Solving for variable 'b'.

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

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

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

Combine like terms: 7b + -7b = 0
18 + -1b = -21 + 0
18 + -1b = -21

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

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

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

Divide each side by '-1'.
b = 39

Simplifying
b = 39

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