30+90+(y-15)=180

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Solution for 30+90+(y-15)=180 equation: 


Simplifying
30 + 90 + (y + -15) = 180

Reorder the terms:
30 + 90 + (-15 + y) = 180

Remove parenthesis around (-15 + y)
30 + 90 + -15 + y = 180

Combine like terms: 30 + 90 = 120
120 + -15 + y = 180

Combine like terms: 120 + -15 = 105
105 + y = 180

Solving
105 + y = 180

Solving for variable 'y'.

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

Add '-105' to each side of the equation.
105 + -105 + y = 180 + -105

Combine like terms: 105 + -105 = 0
0 + y = 180 + -105
y = 180 + -105

Combine like terms: 180 + -105 = 75
y = 75

Simplifying
y = 75

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