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7y+7=6y+21
We simplify the equation to the form, which is simple to understand
7y+7=6y+21
We move all terms containing y to the left and all other terms to the right.
+7y-6y=+21-7
We simplify left and right side of the equation.
+1y=+14
We divide both sides of the equation by 1 to get y.
y=14
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