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.2y-15=.8y-9
We simplify the equation to the form, which is simple to understand
.2y-15=.8y-9
We move all terms containing y to the left and all other terms to the right.
+ 0.2y-0.8y=-9+15
We simplify left and right side of the equation.
-0.6y=+6
We divide both sides of the equation by -0.6 to get y.
y=-10
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