30=2(9+b)

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Solution for 30=2(9+b) equation:


Simplifying
30 = 2(9 + b)
30 = (9 * 2 + b * 2)
30 = (18 + 2b)

Solving
30 = 18 + 2b

Solving for variable 'b'.

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

Add '-2b' to each side of the equation.
30 + -2b = 18 + 2b + -2b

Combine like terms: 2b + -2b = 0
30 + -2b = 18 + 0
30 + -2b = 18

Add '-30' to each side of the equation.
30 + -30 + -2b = 18 + -30

Combine like terms: 30 + -30 = 0
0 + -2b = 18 + -30
-2b = 18 + -30

Combine like terms: 18 + -30 = -12
-2b = -12

Divide each side by '-2'.
b = 6

Simplifying
b = 6

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