105=3y-15

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Solution for 105=3y-15 equation:


Simplifying
105 = 3y + -15

Reorder the terms:
105 = -15 + 3y

Solving
105 = -15 + 3y

Solving for variable 'y'.

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

Add '-3y' to each side of the equation.
105 + -3y = -15 + 3y + -3y

Combine like terms: 3y + -3y = 0
105 + -3y = -15 + 0
105 + -3y = -15

Add '-105' to each side of the equation.
105 + -105 + -3y = -15 + -105

Combine like terms: 105 + -105 = 0
0 + -3y = -15 + -105
-3y = -15 + -105

Combine like terms: -15 + -105 = -120
-3y = -120

Divide each side by '-3'.
y = 40

Simplifying
y = 40

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