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8a-64=0
8a-64=0
8a=64/:8
a=8
e)
6r+4=7
6r=7-4
6r=3/:6
r=1/2
f)
-15t_46=-1
-15t-46=-1
-15t=-1+46
-15t=45/:(-15)
t=-3
e) 6r=3 r=1/2
f ) -15t=45 t = -3