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4y-6=4y-9
We simplify the equation to the form, which is simple to understand
4y-6=4y-9
We move all terms containing y to the left and all other terms to the right.
+4y-4y=-9+6
We simplify left and right side of the equation.
y=-3
0=-3
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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