5-2(y-1)=21

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Solution for 5-2(y-1)=21 equation:


Simplifying
5 + -2(y + -1) = 21

Reorder the terms:
5 + -2(-1 + y) = 21
5 + (-1 * -2 + y * -2) = 21
5 + (2 + -2y) = 21

Combine like terms: 5 + 2 = 7
7 + -2y = 21

Solving
7 + -2y = 21

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 + -2y = 21 + -7

Combine like terms: 7 + -7 = 0
0 + -2y = 21 + -7
-2y = 21 + -7

Combine like terms: 21 + -7 = 14
-2y = 14

Divide each side by '-2'.
y = -7

Simplifying
y = -7

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