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2y+y=15
3y=15 / :3
y=5
x=2*5
y=5
x=10
y=5
x+y=7
2x+3y=15
x=7-y
2(7-y)+3y=15
x=7-y
14-2y+3y=15
y=15-14
x=7-y
y=1
x=7-1
y=1
x=6
y=1
y=2x
x-y=6
y=2x
x-2x=6
y=2x
-x=6 / :-1
y=2x
x=-6
y=2*(-6)
x=-6
y=-12
x=-6
x-y=4
5x+2y=13
x=4+y
5(4+y)+2y=13
x=4+y
20+5y+2y=13
x=4+y
7y= -7 / :7
x=4+y
y= -1
x=4+(-1)
y=-1
x=3
y=-1
y=x+2
2x-y=5
y=x+2
2x-x+2=5
y=x+2
x=3
y=3+2
x=3
y=5
x=3
2y+y=15
x=2y
3y=15 / :3
x=2y
y=5
x+y=7
2x+3y=15
x=7-y
2x+3y=15
x=7-y
2*(7-y)+3y=15
x=7-y
14-2y+3y=15
x=7-y
14+y=15 / -14
x=7-y
y=1
x=7-1
y=1
x=6
y=1