-4(1-3b)=21+7b

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Solution for -4(1-3b)=21+7b equation:


Simplifying
-4(1 + -3b) = 21 + 7b
(1 * -4 + -3b * -4) = 21 + 7b
(-4 + 12b) = 21 + 7b

Solving
-4 + 12b = 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.
-4 + 12b + -7b = 21 + 7b + -7b

Combine like terms: 12b + -7b = 5b
-4 + 5b = 21 + 7b + -7b

Combine like terms: 7b + -7b = 0
-4 + 5b = 21 + 0
-4 + 5b = 21

Add '4' to each side of the equation.
-4 + 4 + 5b = 21 + 4

Combine like terms: -4 + 4 = 0
0 + 5b = 21 + 4
5b = 21 + 4

Combine like terms: 21 + 4 = 25
5b = 25

Divide each side by '5'.
b = 5

Simplifying
b = 5

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