7+-1y-3y=-1

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Solution for 7+-1y-3y=-1 equation: 


Simplifying
7 + -1y + -3y = -1

Combine like terms: -1y + -3y = -4y
7 + -4y = -1

Solving
7 + -4y = -1

Solving for variable 'y'.

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

Add '-7' to each side of the equation.
7 + -7 + -4y = -1 + -7

Combine like terms: 7 + -7 = 0
0 + -4y = -1 + -7
-4y = -1 + -7

Combine like terms: -1 + -7 = -8
-4y = -8

Divide each side by '-4'.
y = 2

Simplifying
y = 2

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