17=21-4y

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Solution for 17=21-4y equation:


Simplifying
17 = 21 + -4y

Solving
17 = 21 + -4y

Solving for variable 'y'.

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

Add '4y' to each side of the equation.
17 + 4y = 21 + -4y + 4y

Combine like terms: -4y + 4y = 0
17 + 4y = 21 + 0
17 + 4y = 21

Add '-17' to each side of the equation.
17 + -17 + 4y = 21 + -17

Combine like terms: 17 + -17 = 0
0 + 4y = 21 + -17
4y = 21 + -17

Combine like terms: 21 + -17 = 4
4y = 4

Divide each side by '4'.
y = 1

Simplifying
y = 1

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