4b+15-6b-9=8-20

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Solution for 4b+15-6b-9=8-20 equation:


Simplifying
4b + 15 + -6b + -9 = 8 + -20

Reorder the terms:
15 + -9 + 4b + -6b = 8 + -20

Combine like terms: 15 + -9 = 6
6 + 4b + -6b = 8 + -20

Combine like terms: 4b + -6b = -2b
6 + -2b = 8 + -20

Combine like terms: 8 + -20 = -12
6 + -2b = -12

Solving
6 + -2b = -12

Solving for variable 'b'.

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

Add '-6' to each side of the equation.
6 + -6 + -2b = -12 + -6

Combine like terms: 6 + -6 = 0
0 + -2b = -12 + -6
-2b = -12 + -6

Combine like terms: -12 + -6 = -18
-2b = -18

Divide each side by '-2'.
b = 9

Simplifying
b = 9

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