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2) y= 17 - 4= 13
3) p= 19-6=13
4) x = 19-9=10
5) t= -15+2= -13
6) b=-9+1=-8
7) z= -21-5=-26
8) 2y-y= 4
y= 4
9) q= 75-21=54
10) x =13+7=20