(y-4)-(y+5)=7y

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Solution for (y-4)-(y+5)=7y equation:


Simplifying
(y + -4) + -1(y + 5) = 7y

Reorder the terms:
(-4 + y) + -1(y + 5) = 7y

Remove parenthesis around (-4 + y)
-4 + y + -1(y + 5) = 7y

Reorder the terms:
-4 + y + -1(5 + y) = 7y
-4 + y + (5 * -1 + y * -1) = 7y
-4 + y + (-5 + -1y) = 7y

Reorder the terms:
-4 + -5 + y + -1y = 7y

Combine like terms: -4 + -5 = -9
-9 + y + -1y = 7y

Combine like terms: y + -1y = 0
-9 + 0 = 7y
-9 = 7y

Solving
-9 = 7y

Solving for variable 'y'.

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

Add '-7y' to each side of the equation.
-9 + -7y = 7y + -7y

Combine like terms: 7y + -7y = 0
-9 + -7y = 0

Add '9' to each side of the equation.
-9 + 9 + -7y = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -7y = 0 + 9
-7y = 0 + 9

Combine like terms: 0 + 9 = 9
-7y = 9

Divide each side by '-7'.
y = -1.285714286

Simplifying
y = -1.285714286

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