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`21+4y=54-7y`

We simplify the equation to the form, which is simple to understand

21+4y=54-7y

We move all terms containing y to the left and all other terms to the right.

+4y+7y=+54-21

We simplify left and right side of the equation.

+11y=+33

We divide both sides of the equation by 11 to get y.

y=3

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