3-(2-4b)=21

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Solution for 3-(2-4b)=21 equation:


Simplifying
3 + -1(2 + -4b) = 21
3 + (2 * -1 + -4b * -1) = 21
3 + (-2 + 4b) = 21

Combine like terms: 3 + -2 = 1
1 + 4b = 21

Solving
1 + 4b = 21

Solving for variable 'b'.

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

Add '-1' to each side of the equation.
1 + -1 + 4b = 21 + -1

Combine like terms: 1 + -1 = 0
0 + 4b = 21 + -1
4b = 21 + -1

Combine like terms: 21 + -1 = 20
4b = 20

Divide each side by '4'.
b = 5

Simplifying
b = 5

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