4y-15=y-42

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Solution for 4y-15=y-42 equation:


Simplifying
4y + -15 = y + -42

Reorder the terms:
-15 + 4y = y + -42

Reorder the terms:
-15 + 4y = -42 + y

Solving
-15 + 4y = -42 + y

Solving for variable 'y'.

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

Add '-1y' to each side of the equation.
-15 + 4y + -1y = -42 + y + -1y

Combine like terms: 4y + -1y = 3y
-15 + 3y = -42 + y + -1y

Combine like terms: y + -1y = 0
-15 + 3y = -42 + 0
-15 + 3y = -42

Add '15' to each side of the equation.
-15 + 15 + 3y = -42 + 15

Combine like terms: -15 + 15 = 0
0 + 3y = -42 + 15
3y = -42 + 15

Combine like terms: -42 + 15 = -27
3y = -27

Divide each side by '3'.
y = -9

Simplifying
y = -9

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