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28y=13+(-4)
We simplify the equation to the form, which is simple to understand
28y=13+(-4)
Remove unnecessary parentheses
+28y=+13-4
We move all terms containing y to the left and all other terms to the right.
+28y=+13-4
We simplify left and right side of the equation.
+28y=+9
We divide both sides of the equation by 28 to get y.
y=0.321428571429
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