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31+4y-y=40
We simplify the equation to the form, which is simple to understand
31+4y-y=40
We move all terms containing y to the left and all other terms to the right.
+4y-1y=+40-31
We simplify left and right side of the equation.
+3y=+9
We divide both sides of the equation by 3 to get y.
y=3
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