3(20-b)=36

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Solution for 3(20-b)=36 equation: 


Simplifying
3(20 + -1b) = 36
(20 * 3 + -1b * 3) = 36
(60 + -3b) = 36

Solving
60 + -3b = 36

Solving for variable 'b'.

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

Add '-60' to each side of the equation.
60 + -60 + -3b = 36 + -60

Combine like terms: 60 + -60 = 0
0 + -3b = 36 + -60
-3b = 36 + -60

Combine like terms: 36 + -60 = -24
-3b = -24

Divide each side by '-3'.
b = 8

Simplifying
b = 8

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