7=4-y-y

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Solution for 7=4-y-y equation:


Simplifying
7 = 4 + -1y + -1y

Combine like terms: -1y + -1y = -2y
7 = 4 + -2y

Solving
7 = 4 + -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.
7 + 2y = 4 + -2y + 2y

Combine like terms: -2y + 2y = 0
7 + 2y = 4 + 0
7 + 2y = 4

Add '-7' to each side of the equation.
7 + -7 + 2y = 4 + -7

Combine like terms: 7 + -7 = 0
0 + 2y = 4 + -7
2y = 4 + -7

Combine like terms: 4 + -7 = -3
2y = -3

Divide each side by '2'.
y = -1.5

Simplifying
y = -1.5

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