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21-y=-87-2
We simplify the equation to the form, which is simple to understand
21-y=-87-2
We move all terms containing y to the left and all other terms to the right.
-1y=-87-2-21
We simplify left and right side of the equation.
-1y=-110
We divide both sides of the equation by -1 to get y.
y=110
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