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10+18=15y-21+5y
We simplify the equation to the form, which is simple to understand
10+18=15y-21+5y
We move all terms containing y to the left and all other terms to the right.
-15y-5y=-21-10-18
We simplify left and right side of the equation.
-20y=-49
We divide both sides of the equation by -20 to get y.
y=2.45
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