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y=2x
x-2x=15
y=2x
-x=15/ -1
y=2x
x=-15
y=2x
x=-15
y=2* (-15)
x=-15
y=-30
{y=-2x
{-x-3*(-2x)=15
{y=-2x
{-x+6x=15
{y=-2
{5x=15/:5
{y=-2x
{x=3
{y=-2*3
{x=3
{y=-6