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-3.5x+57=y
Swap sides so that all variable terms are on the left hand side.
-3.5x=y-57
Subtract 57 from both sides.
\frac{-3.5x}{-3.5}=\frac{y-57}{-3.5}
Divide both sides of the equation by -3.5, which is the same as multiplying both sides by the reciprocal of the fraction.
x=\frac{y-57}{-3.5}
Dividing by -3.5 undoes the multiplication by -3.5.
x=\frac{114-2y}{7}
Divide y-57 by -3.5 by multiplying y-57 by the reciprocal of -3.5.