(90+-2y+y+10)+2(90+-2y)=180

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Solution for (90+-2y+y+10)+2(90+-2y)=180 equation: 


Simplifying
(90 + -2y + y + 10) + 2(90 + -2y) = 180

Reorder the terms:
(90 + 10 + -2y + y) + 2(90 + -2y) = 180

Combine like terms: 90 + 10 = 100
(100 + -2y + y) + 2(90 + -2y) = 180

Combine like terms: -2y + y = -1y
(100 + -1y) + 2(90 + -2y) = 180

Remove parenthesis around (100 + -1y)
100 + -1y + 2(90 + -2y) = 180
100 + -1y + (90 * 2 + -2y * 2) = 180
100 + -1y + (180 + -4y) = 180

Reorder the terms:
100 + 180 + -1y + -4y = 180

Combine like terms: 100 + 180 = 280
280 + -1y + -4y = 180

Combine like terms: -1y + -4y = -5y
280 + -5y = 180

Solving
280 + -5y = 180

Solving for variable 'y'.

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

Add '-280' to each side of the equation.
280 + -280 + -5y = 180 + -280

Combine like terms: 280 + -280 = 0
0 + -5y = 180 + -280
-5y = 180 + -280

Combine like terms: 180 + -280 = -100
-5y = -100

Divide each side by '-5'.
y = 20

Simplifying
y = 20

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