91-87=39y-43y

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Solution for 91-87=39y-43y equation:


Simplifying
91 + -87 = 39y + -43y

Combine like terms: 91 + -87 = 4
4 = 39y + -43y

Combine like terms: 39y + -43y = -4y
4 = -4y

Solving
4 = -4y

Solving for variable 'y'.

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

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

Combine like terms: -4y + 4y = 0
4 + 4y = 0

Add '-4' to each side of the equation.
4 + -4 + 4y = 0 + -4

Combine like terms: 4 + -4 = 0
0 + 4y = 0 + -4
4y = 0 + -4

Combine like terms: 0 + -4 = -4
4y = -4

Divide each side by '4'.
y = -1

Simplifying
y = -1

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