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9+10+y=21
We simplify the equation to the form, which is simple to understand
9+10+y=21
We move all terms containing y to the left and all other terms to the right.
+1y=+21-9-10
We simplify left and right side of the equation.
+1y=+2
We divide both sides of the equation by 1 to get y.
y=2
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