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{x+y=7
{x-y=3
-------------
2x=10 |:2
x=5
b)
{3x+2y=2
{3x-y=-10 |*2
{3x+2y=2
{6x-2y=-20
-----------------
9x=-18 |:9
x=-2
c)
{2x+3y=3
{4x+3y=-9 |*(-1)
{2x+3y=3
{-4x-3y=9
---------------
-2x=12 |:(-2)
x=-2