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0.25x+2.5=y
Swap sides so that all variable terms are on the left hand side.
0.25x=y-2.5
Subtract 2.5 from both sides.
\frac{0.25x}{0.25}=\frac{y-2.5}{0.25}
Multiply both sides by 4.
x=\frac{y-2.5}{0.25}
Dividing by 0.25 undoes the multiplication by 0.25.
x=4y-10
Divide y-2.5 by 0.25 by multiplying y-2.5 by the reciprocal of 0.25.