(y-30)+(2y)=90

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Solution for (y-30)+(2y)=90 equation:


Simplifying
(y + -30) + (2y) = 90

Reorder the terms:
(-30 + y) + (2y) = 90

Remove parenthesis around (-30 + y)
-30 + y + (2y) = 90

Combine like terms: y + (2y) = 3y
-30 + 3y = 90

Solving
-30 + 3y = 90

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 + 3y = 90 + 30

Combine like terms: -30 + 30 = 0
0 + 3y = 90 + 30
3y = 90 + 30

Combine like terms: 90 + 30 = 120
3y = 120

Divide each side by '3'.
y = 40

Simplifying
y = 40

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