3(4-b)=-6b+21

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Solution for 3(4-b)=-6b+21 equation:


Simplifying
3(4 + -1b) = -6b + 21
(4 * 3 + -1b * 3) = -6b + 21
(12 + -3b) = -6b + 21

Reorder the terms:
12 + -3b = 21 + -6b

Solving
12 + -3b = 21 + -6b

Solving for variable 'b'.

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

Add '6b' to each side of the equation.
12 + -3b + 6b = 21 + -6b + 6b

Combine like terms: -3b + 6b = 3b
12 + 3b = 21 + -6b + 6b

Combine like terms: -6b + 6b = 0
12 + 3b = 21 + 0
12 + 3b = 21

Add '-12' to each side of the equation.
12 + -12 + 3b = 21 + -12

Combine like terms: 12 + -12 = 0
0 + 3b = 21 + -12
3b = 21 + -12

Combine like terms: 21 + -12 = 9
3b = 9

Divide each side by '3'.
b = 3

Simplifying
b = 3

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