84=7-Y

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Solution for 84=7-Y equation:


Simplifying
84 = 7 + -1Y

Solving
84 = 7 + -1Y

Solving for variable 'Y'.

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

Add 'Y' to each side of the equation.
84 + Y = 7 + -1Y + Y

Combine like terms: -1Y + Y = 0
84 + Y = 7 + 0
84 + Y = 7

Add '-84' to each side of the equation.
84 + -84 + Y = 7 + -84

Combine like terms: 84 + -84 = 0
0 + Y = 7 + -84
Y = 7 + -84

Combine like terms: 7 + -84 = -77
Y = -77

Simplifying
Y = -77

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