-20.5=-8.5+3.5(y+9)

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Solution for -20.5=-8.5+3.5(y+9) equation: 


Simplifying
-20.5 = -8.5 + 3.5(y + 9)

Reorder the terms:
-20.5 = -8.5 + 3.5(9 + y)
-20.5 = -8.5 + (9 * 3.5 + y * 3.5)
-20.5 = -8.5 + (31.5 + 3.5y)

Combine like terms: -8.5 + 31.5 = 23
-20.5 = 23 + 3.5y

Solving
-20.5 = 23 + 3.5y

Solving for variable 'y'.

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

Add '-3.5y' to each side of the equation.
-20.5 + -3.5y = 23 + 3.5y + -3.5y

Combine like terms: 3.5y + -3.5y = 0.0
-20.5 + -3.5y = 23 + 0.0
-20.5 + -3.5y = 23

Add '20.5' to each side of the equation.
-20.5 + 20.5 + -3.5y = 23 + 20.5

Combine like terms: -20.5 + 20.5 = 0.0
0.0 + -3.5y = 23 + 20.5
-3.5y = 23 + 20.5

Combine like terms: 23 + 20.5 = 43.5
-3.5y = 43.5

Divide each side by '-3.5'.
y = -12.42857143

Simplifying
y = -12.42857143

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