15b-8=31b+21

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Solution for 15b-8=31b+21 equation:


Simplifying
15b + -8 = 31b + 21

Reorder the terms:
-8 + 15b = 31b + 21

Reorder the terms:
-8 + 15b = 21 + 31b

Solving
-8 + 15b = 21 + 31b

Solving for variable 'b'.

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

Add '-31b' to each side of the equation.
-8 + 15b + -31b = 21 + 31b + -31b

Combine like terms: 15b + -31b = -16b
-8 + -16b = 21 + 31b + -31b

Combine like terms: 31b + -31b = 0
-8 + -16b = 21 + 0
-8 + -16b = 21

Add '8' to each side of the equation.
-8 + 8 + -16b = 21 + 8

Combine like terms: -8 + 8 = 0
0 + -16b = 21 + 8
-16b = 21 + 8

Combine like terms: 21 + 8 = 29
-16b = 29

Divide each side by '-16'.
b = -1.8125

Simplifying
b = -1.8125

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