-7b-3=2b-21

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Solution for -7b-3=2b-21 equation:


Simplifying
-7b + -3 = 2b + -21

Reorder the terms:
-3 + -7b = 2b + -21

Reorder the terms:
-3 + -7b = -21 + 2b

Solving
-3 + -7b = -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.
-3 + -7b + -2b = -21 + 2b + -2b

Combine like terms: -7b + -2b = -9b
-3 + -9b = -21 + 2b + -2b

Combine like terms: 2b + -2b = 0
-3 + -9b = -21 + 0
-3 + -9b = -21

Add '3' to each side of the equation.
-3 + 3 + -9b = -21 + 3

Combine like terms: -3 + 3 = 0
0 + -9b = -21 + 3
-9b = -21 + 3

Combine like terms: -21 + 3 = -18
-9b = -18

Divide each side by '-9'.
b = 2

Simplifying
b = 2

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