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2(x+2)+y+1 = 3*4
x-2y=-4
2x+4 +y+1 =12
x-2y = -4
2x+y = 7
x-2y = -4 ========mnożysz *-2
2x+y=7
-2x+4y = 8
5y =15
y =3
2x+3 = 7
2x=4
x = 2