20=15y-(8+9y)

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Solution for 20=15y-(8+9y) equation:


Simplifying
20 = 15y + -1(8 + 9y)
20 = 15y + (8 * -1 + 9y * -1)
20 = 15y + (-8 + -9y)

Reorder the terms:
20 = -8 + 15y + -9y

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

Solving
20 = -8 + 6y

Solving for variable 'y'.

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

Add '-6y' to each side of the equation.
20 + -6y = -8 + 6y + -6y

Combine like terms: 6y + -6y = 0
20 + -6y = -8 + 0
20 + -6y = -8

Add '-20' to each side of the equation.
20 + -20 + -6y = -8 + -20

Combine like terms: 20 + -20 = 0
0 + -6y = -8 + -20
-6y = -8 + -20

Combine like terms: -8 + -20 = -28
-6y = -28

Divide each side by '-6'.
y = 4.666666667

Simplifying
y = 4.666666667

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