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12+y+3y=28
We simplify the equation to the form, which is simple to understand
12+y+3y=28
We move all terms containing y to the left and all other terms to the right.
+1y+3y=+28-12
We simplify left and right side of the equation.
+4y=+16
We divide both sides of the equation by 4 to get y.
y=4
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