91=2(y-a)+y

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Solution for 91=2(y-a)+y equation:


Simplifying
91 = 2(y + -1a) + y

Reorder the terms:
91 = 2(-1a + y) + y
91 = (-1a * 2 + y * 2) + y
91 = (-2a + 2y) + y

Combine like terms: 2y + y = 3y
91 = -2a + 3y

Solving
91 = -2a + 3y

Solving for variable 'a'.

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

Add '2a' to each side of the equation.
91 + 2a = -2a + 2a + 3y

Combine like terms: -2a + 2a = 0
91 + 2a = 0 + 3y
91 + 2a = 3y

Add '-91' to each side of the equation.
91 + -91 + 2a = -91 + 3y

Combine like terms: 91 + -91 = 0
0 + 2a = -91 + 3y
2a = -91 + 3y

Divide each side by '2'.
a = -45.5 + 1.5y

Simplifying
a = -45.5 + 1.5y

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