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{4x+3y=21
{-4x+4y=-14
{4x+3y=21
-----------------
4y+3y=-14+21
7y=7/:7
y=1
4x+3y=21
4x+3*1=21
4x+3=21
4x=21-3
4x=18/:4
x=4,5
{2x+3y=14/*2
{3x-2y=8/*3
{4x+6y=28
{9x-6y=24
-------------
4x+9x=28+24
13x=52/:13
x=4
2x+3y=14
2*4+3y=14
8+3y=14
3y=14-8
3y=6/:3
y=2