y+y+(2y-20)+(2y-20)+(2y-20)+(2y-20)=720

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Solution for y+y+(2y-20)+(2y-20)+(2y-20)+(2y-20)=720 equation: 


Simplifying
y + y + (2y + -20) + (2y + -20) + (2y + -20) + (2y + -20) = 720

Reorder the terms:
y + y + (-20 + 2y) + (2y + -20) + (2y + -20) + (2y + -20) = 720

Remove parenthesis around (-20 + 2y)
y + y + -20 + 2y + (2y + -20) + (2y + -20) + (2y + -20) = 720

Reorder the terms:
y + y + -20 + 2y + (-20 + 2y) + (2y + -20) + (2y + -20) = 720

Remove parenthesis around (-20 + 2y)
y + y + -20 + 2y + -20 + 2y + (2y + -20) + (2y + -20) = 720

Reorder the terms:
y + y + -20 + 2y + -20 + 2y + (-20 + 2y) + (2y + -20) = 720

Remove parenthesis around (-20 + 2y)
y + y + -20 + 2y + -20 + 2y + -20 + 2y + (2y + -20) = 720

Reorder the terms:
y + y + -20 + 2y + -20 + 2y + -20 + 2y + (-20 + 2y) = 720

Remove parenthesis around (-20 + 2y)
y + y + -20 + 2y + -20 + 2y + -20 + 2y + -20 + 2y = 720

Reorder the terms:
-20 + -20 + -20 + -20 + y + y + 2y + 2y + 2y + 2y = 720

Combine like terms: -20 + -20 = -40
-40 + -20 + -20 + y + y + 2y + 2y + 2y + 2y = 720

Combine like terms: -40 + -20 = -60
-60 + -20 + y + y + 2y + 2y + 2y + 2y = 720

Combine like terms: -60 + -20 = -80
-80 + y + y + 2y + 2y + 2y + 2y = 720

Combine like terms: y + y = 2y
-80 + 2y + 2y + 2y + 2y + 2y = 720

Combine like terms: 2y + 2y = 4y
-80 + 4y + 2y + 2y + 2y = 720

Combine like terms: 4y + 2y = 6y
-80 + 6y + 2y + 2y = 720

Combine like terms: 6y + 2y = 8y
-80 + 8y + 2y = 720

Combine like terms: 8y + 2y = 10y
-80 + 10y = 720

Solving
-80 + 10y = 720

Solving for variable 'y'.

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

Add '80' to each side of the equation.
-80 + 80 + 10y = 720 + 80

Combine like terms: -80 + 80 = 0
0 + 10y = 720 + 80
10y = 720 + 80

Combine like terms: 720 + 80 = 800
10y = 800

Divide each side by '10'.
y = 80

Simplifying
y = 80

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