30=5b-8b

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Solution for 30=5b-8b equation:


Simplifying
30 = 5b + -8b

Combine like terms: 5b + -8b = -3b
30 = -3b

Solving
30 = -3b

Solving for variable 'b'.

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

Add '3b' to each side of the equation.
30 + 3b = -3b + 3b

Combine like terms: -3b + 3b = 0
30 + 3b = 0

Add '-30' to each side of the equation.
30 + -30 + 3b = 0 + -30

Combine like terms: 30 + -30 = 0
0 + 3b = 0 + -30
3b = 0 + -30

Combine like terms: 0 + -30 = -30
3b = -30

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

Simplifying
b = -10

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