90=b+15b+30+15+2b-9

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Solution for 90=b+15b+30+15+2b-9 equation:


Simplifying
90 = b + 15b + 30 + 15 + 2b + -9

Reorder the terms:
90 = 30 + 15 + -9 + b + 15b + 2b

Combine like terms: 30 + 15 = 45
90 = 45 + -9 + b + 15b + 2b

Combine like terms: 45 + -9 = 36
90 = 36 + b + 15b + 2b

Combine like terms: b + 15b = 16b
90 = 36 + 16b + 2b

Combine like terms: 16b + 2b = 18b
90 = 36 + 18b

Solving
90 = 36 + 18b

Solving for variable 'b'.

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

Add '-18b' to each side of the equation.
90 + -18b = 36 + 18b + -18b

Combine like terms: 18b + -18b = 0
90 + -18b = 36 + 0
90 + -18b = 36

Add '-90' to each side of the equation.
90 + -90 + -18b = 36 + -90

Combine like terms: 90 + -90 = 0
0 + -18b = 36 + -90
-18b = 36 + -90

Combine like terms: 36 + -90 = -54
-18b = -54

Divide each side by '-18'.
b = 3

Simplifying
b = 3

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