y-x=7
4y-x=22
y=7+x
4(7+x)-x=22
28+4x-x=22
3x= -6 / : 3
x= -2
y= 5
(y-x=7 / * (-1)
(4y-x=22
(-y+x=-7
(4y - x=22
3y = 15
y=5
x=-2
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y-x=7
4y-x=22
y=7+x
4(7+x)-x=22
y=7+x
28+4x-x=22
y=7+x
3x= -6 / : 3
y=7+x
x= -2
y= 5
x= -2
(y-x=7 / * (-1)
(4y-x=22
(-y+x=-7
(4y - x=22
3y = 15
y=5
x=-2