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y+4x=3y-6x
2x-y=-4
10x=2y / : 10
2x-y=-4
x=0,2y
2*0,2y-y=-4
x=0,2y
0,4y-y=-4
x=0,2y
-0,6=-4
x=0,2y
y=40/6
x=0,2*40/6
y=40/6
x=8/6
1.2x+3=2*8/6+3=5⅔
2.y+4x=40/6+4*8/6=72/6=12
3.y-1=40/6-1=5⅔
4.3y-6x=3*40/6-6*8/6=12