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3x+4y=8
3(5+y)+4y=8
15+3y+4y=8
7y=8-15
7y=-7/:7
y=-1
x-(-1)=5
x=5-1
x=4
4-(-1)=5
4+1=5
3y+15+4y=8
7y=8-15
7y=-7/:7
y=-1
x=-1+5
x=4
x-y=5
4+1=5