21-3(b-7)=b+20

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Solution for 21-3(b-7)=b+20 equation:


Simplifying
21 + -3(b + -7) = b + 20

Reorder the terms:
21 + -3(-7 + b) = b + 20
21 + (-7 * -3 + b * -3) = b + 20
21 + (21 + -3b) = b + 20

Combine like terms: 21 + 21 = 42
42 + -3b = b + 20

Reorder the terms:
42 + -3b = 20 + b

Solving
42 + -3b = 20 + 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.
42 + -3b + -1b = 20 + b + -1b

Combine like terms: -3b + -1b = -4b
42 + -4b = 20 + b + -1b

Combine like terms: b + -1b = 0
42 + -4b = 20 + 0
42 + -4b = 20

Add '-42' to each side of the equation.
42 + -42 + -4b = 20 + -42

Combine like terms: 42 + -42 = 0
0 + -4b = 20 + -42
-4b = 20 + -42

Combine like terms: 20 + -42 = -22
-4b = -22

Divide each side by '-4'.
b = 5.5

Simplifying
b = 5.5

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