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x = 4
4 - 2.5 = --6
2x-x=-1+y
x =-1+y
x-y =-1
x+y =9
x-y=-1
_________+
2x =8
x=4
x+y=9
4+y=9
y =9-4
y = 5
x-2y
4- 2(5)
4-10
=-6