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A= {1,2,4,5,10,20}
B= {1,5,7,35}
A-B= {2,4,10,20}
3.)
3x-y= 16
x+y= 12
------------ +
4x+0=28
x=28÷4
x= 7
x+y= 12
7+y=12
y= 12-7
y= 5
(x,y)
(7,5)
x+2y= ?
7+2(5)= ?
7+10= 17
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