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x - 3y = -18
<y=-1-2x
x-3(-1-2x)=-18>
<y=-1-2x
x+3+6x=-18 >
<y=-1-2x
7x=-21>
<y=-1-2x
x=3>
<y=-1-2*3
x=3>
<y=-7
x=3>
2) x-5y-3=2x-6y-14
3x+4y-1= -2x+y+6
<x=y+11
5x=-3y+7>
<x=y+11
5(y+11)=3y+7>
<x=y+11
5y+55=3y+7>
<x=y+11
2y=-48>
<x=y+11
y=-24>
<x=-24+11
y=-24>
<x=-13
y=-24>
3) 3(x-4) - (y-9)= -5
4(x+y-3)= 3(2x-y+7)
<3x-12-y+9=-5
4x+4y-12=-3y+21>
<y=2+3x
7y=-2x-33>
<y=2+3x
7(2+3x)=-2x-33>
<y=2+3x
14+21x=-2x-33>
<y=2+3x
22x=-47>
<y=2+3x
x=2 i 3/22>
<y=5 i 3/22
x=2i 3/22>