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3y+4y+=20
We simplify the equation to the form, which is simple to understand
3y+4y+=20
We move all terms containing y to the left and all other terms to the right.
+3y+4y=+20
We simplify left and right side of the equation.
+7y=+20
We divide both sides of the equation by 7 to get y.
y=2.85714285714
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