y+(y-30)+90=180

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Solution for y+(y-30)+90=180 equation: 


Simplifying
y + (y + -30) + 90 = 180

Reorder the terms:
y + (-30 + y) + 90 = 180

Remove parenthesis around (-30 + y)
y + -30 + y + 90 = 180

Reorder the terms:
-30 + 90 + y + y = 180

Combine like terms: -30 + 90 = 60
60 + y + y = 180

Combine like terms: y + y = 2y
60 + 2y = 180

Solving
60 + 2y = 180

Solving for variable 'y'.

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

Add '-60' to each side of the equation.
60 + -60 + 2y = 180 + -60

Combine like terms: 60 + -60 = 0
0 + 2y = 180 + -60
2y = 180 + -60

Combine like terms: 180 + -60 = 120
2y = 120

Divide each side by '2'.
y = 60

Simplifying
y = 60

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