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6x+15=2y
Add 2y to both sides. Anything plus zero gives itself.
6x=2y-15
Subtract 15 from both sides.
\frac{6x}{6}=\frac{2y-15}{6}
Divide both sides by 6.
x=\frac{2y-15}{6}
Dividing by 6 undoes the multiplication by 6.
x=\frac{y}{3}-\frac{5}{2}
Divide 2y-15 by 6.
-2y+15=-6x
Subtract 6x from both sides. Anything subtracted from zero gives its negation.
-2y=-6x-15
Subtract 15 from both sides.
\frac{-2y}{-2}=\frac{-6x-15}{-2}
Divide both sides by -2.
y=\frac{-6x-15}{-2}
Dividing by -2 undoes the multiplication by -2.
y=3x+\frac{15}{2}
Divide -6x-15 by -2.