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3(-7)-y=2
We simplify the equation to the form, which is simple to understand
3(-7)-y=2
Reorder the terms in parentheses
+(-21)-y=2
Remove unnecessary parentheses
-21-y=+2
We move all terms containing y to the left and all other terms to the right.
-1y=+2+21
We simplify left and right side of the equation.
-1y=+23
We divide both sides of the equation by -1 to get y.
y=-23
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