78=3y+12-y+4

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Solution for 78=3y+12-y+4 equation:


Simplifying
78 = 3y + 12 + -1y + 4

Reorder the terms:
78 = 12 + 4 + 3y + -1y

Combine like terms: 12 + 4 = 16
78 = 16 + 3y + -1y

Combine like terms: 3y + -1y = 2y
78 = 16 + 2y

Solving
78 = 16 + 2y

Solving for variable 'y'.

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

Add '-2y' to each side of the equation.
78 + -2y = 16 + 2y + -2y

Combine like terms: 2y + -2y = 0
78 + -2y = 16 + 0
78 + -2y = 16

Add '-78' to each side of the equation.
78 + -78 + -2y = 16 + -78

Combine like terms: 78 + -78 = 0
0 + -2y = 16 + -78
-2y = 16 + -78

Combine like terms: 16 + -78 = -62
-2y = -62

Divide each side by '-2'.
y = 31

Simplifying
y = 31

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