86=21-13y

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Solution for 86=21-13y equation:


Simplifying
86 = 21 + -13y

Solving
86 = 21 + -13y

Solving for variable 'y'.

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

Add '13y' to each side of the equation.
86 + 13y = 21 + -13y + 13y

Combine like terms: -13y + 13y = 0
86 + 13y = 21 + 0
86 + 13y = 21

Add '-86' to each side of the equation.
86 + -86 + 13y = 21 + -86

Combine like terms: 86 + -86 = 0
0 + 13y = 21 + -86
13y = 21 + -86

Combine like terms: 21 + -86 = -65
13y = -65

Divide each side by '13'.
y = -5

Simplifying
y = -5

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