2(7b-4)=b-21

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Solution for 2(7b-4)=b-21 equation:


Simplifying
2(7b + -4) = b + -21

Reorder the terms:
2(-4 + 7b) = b + -21
(-4 * 2 + 7b * 2) = b + -21
(-8 + 14b) = b + -21

Reorder the terms:
-8 + 14b = -21 + b

Solving
-8 + 14b = -21 + b

Solving for variable 'b'.

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

Add '-1b' to each side of the equation.
-8 + 14b + -1b = -21 + b + -1b

Combine like terms: 14b + -1b = 13b
-8 + 13b = -21 + b + -1b

Combine like terms: b + -1b = 0
-8 + 13b = -21 + 0
-8 + 13b = -21

Add '8' to each side of the equation.
-8 + 8 + 13b = -21 + 8

Combine like terms: -8 + 8 = 0
0 + 13b = -21 + 8
13b = -21 + 8

Combine like terms: -21 + 8 = -13
13b = -13

Divide each side by '13'.
b = -1

Simplifying
b = -1

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