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x+y=10--> x=10-y
4x+y=28
4(10-y) + y = 28
40-4y+y=28
40-3y= 28
-3y=28-40
-3y=-12
y=-12/-3
y=4
x=10-y
x=10-4
x=6
x=6, y=4
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