7y+12.8=13(y-1)

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Solution for 7y+12.8=13(y-1) equation: 


Simplifying
7y + 12.8 = 13(y + -1)

Reorder the terms:
12.8 + 7y = 13(y + -1)

Reorder the terms:
12.8 + 7y = 13(-1 + y)
12.8 + 7y = (-1 * 13 + y * 13)
12.8 + 7y = (-13 + 13y)

Solving
12.8 + 7y = -13 + 13y

Solving for variable 'y'.

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

Add '-13y' to each side of the equation.
12.8 + 7y + -13y = -13 + 13y + -13y

Combine like terms: 7y + -13y = -6y
12.8 + -6y = -13 + 13y + -13y

Combine like terms: 13y + -13y = 0
12.8 + -6y = -13 + 0
12.8 + -6y = -13

Add '-12.8' to each side of the equation.
12.8 + -12.8 + -6y = -13 + -12.8

Combine like terms: 12.8 + -12.8 = 0.0
0.0 + -6y = -13 + -12.8
-6y = -13 + -12.8

Combine like terms: -13 + -12.8 = -25.8
-6y = -25.8

Divide each side by '-6'.
y = 4.3

Simplifying
y = 4.3

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