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5(x-y) -3(2y+y)= -3
3x-6y+2x+2y=4
5x-5y-9y= -3
5x-4y=4
5x-14y= -3
odejmujemy stronami
5x-5x-4y-(-14y)=4-(-3)
-4y+14y=4+3
10y=7
y=0.7
Podstawiamy...
5x-4y=4
y=0.7
5x-4*0.7=4
5x-2.8=4
5x=4+2.8
5x=6.8
x=1.36