y+(y-30)=180

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


Simplifying
y + (y + -30) = 180

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

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

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

Combine like terms: y + y = 2y
-30 + 2y = 180

Solving
-30 + 2y = 180

Solving for variable 'y'.

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

Add '30' to each side of the equation.
-30 + 30 + 2y = 180 + 30

Combine like terms: -30 + 30 = 0
0 + 2y = 180 + 30
2y = 180 + 30

Combine like terms: 180 + 30 = 210
2y = 210

Divide each side by '2'.
y = 105

Simplifying
y = 105

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