4-20+5b-5=87

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Solution for 4-20+5b-5=87 equation:


Simplifying
4 + -20 + 5b + -5 = 87

Reorder the terms:
4 + -20 + -5 + 5b = 87

Combine like terms: 4 + -20 = -16
-16 + -5 + 5b = 87

Combine like terms: -16 + -5 = -21
-21 + 5b = 87

Solving
-21 + 5b = 87

Solving for variable 'b'.

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

Add '21' to each side of the equation.
-21 + 21 + 5b = 87 + 21

Combine like terms: -21 + 21 = 0
0 + 5b = 87 + 21
5b = 87 + 21

Combine like terms: 87 + 21 = 108
5b = 108

Divide each side by '5'.
b = 21.6

Simplifying
b = 21.6

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