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21+3y=10
We simplify the equation to the form, which is simple to understand
21+3y=10
We move all terms containing y to the left and all other terms to the right.
+3y=+10-21
We simplify left and right side of the equation.
+3y=-11
We divide both sides of the equation by 3 to get y.
y=-3.66666666667
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