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2,5y-1,5(-2+y)=2
x=-2+y
2.5y+3-1,5y=2
x=-2+y
y=-1
x=-3
y=-1
2)x=2y-6
4(2y-6)+7y-6=0
x=2y-6
8y-24+7y-6=0
x=2y-6
15y=-30 / :15
x=2y-6
y=-2
x=-10
y=-2
3) y=1-3x
-3x+1-3x=13
y=1-3x
-6x=12 / :(-6)
y=-5
x=-2