3(b-3)=13b+21

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Solution for 3(b-3)=13b+21 equation:


Simplifying
3(b + -3) = 13b + 21

Reorder the terms:
3(-3 + b) = 13b + 21
(-3 * 3 + b * 3) = 13b + 21
(-9 + 3b) = 13b + 21

Reorder the terms:
-9 + 3b = 21 + 13b

Solving
-9 + 3b = 21 + 13b

Solving for variable 'b'.

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

Add '-13b' to each side of the equation.
-9 + 3b + -13b = 21 + 13b + -13b

Combine like terms: 3b + -13b = -10b
-9 + -10b = 21 + 13b + -13b

Combine like terms: 13b + -13b = 0
-9 + -10b = 21 + 0
-9 + -10b = 21

Add '9' to each side of the equation.
-9 + 9 + -10b = 21 + 9

Combine like terms: -9 + 9 = 0
0 + -10b = 21 + 9
-10b = 21 + 9

Combine like terms: 21 + 9 = 30
-10b = 30

Divide each side by '-10'.
b = -3

Simplifying
b = -3

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