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2.5x-4=y
Swap sides so that all variable terms are on the left hand side.
2.5x=y+4
Add 4 to both sides.
\frac{2.5x}{2.5}=\frac{y+4}{2.5}
Divide both sides of the equation by 2.5, which is the same as multiplying both sides by the reciprocal of the fraction.
x=\frac{y+4}{2.5}
Dividing by 2.5 undoes the multiplication by 2.5.
x=\frac{2y+8}{5}
Divide y+4 by 2.5 by multiplying y+4 by the reciprocal of 2.5.