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-3y-9y+54=2,1
We simplify the equation to the form, which is simple to understand
-3y-9y+54=2,1
We move all terms containing y to the left and all other terms to the right.
-3y-9y=+2.1-54
We simplify left and right side of the equation.
-12y=-51.9
We divide both sides of the equation by -12 to get y.
y=4.325
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