18=9b+4b

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Solution for 18=9b+4b equation:


Simplifying
18 = 9b + 4b

Combine like terms: 9b + 4b = 13b
18 = 13b

Solving
18 = 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.
18 + -13b = 13b + -13b

Combine like terms: 13b + -13b = 0
18 + -13b = 0

Add '-18' to each side of the equation.
18 + -18 + -13b = 0 + -18

Combine like terms: 18 + -18 = 0
0 + -13b = 0 + -18
-13b = 0 + -18

Combine like terms: 0 + -18 = -18
-13b = -18

Divide each side by '-13'.
b = 1.384615385

Simplifying
b = 1.384615385

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