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b)15-1+1=15
c)-1-1=-2
d)9-15+5=-1
b)15-3x+7a= 15-0,99+0,98=14,99
c)4z-15y= -1-0,9 = -1,9
d)3x-2y+5=3*3 - 2*7+5 = 9-14+5 =0