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-1/f= 1/v - 1/u
-1/f + 1/1.5f = 1/v
-1.5f+f/1.5f2 = 1/v
1/v = -3
-1/f=1/v-1/u
-1/f+1/1.5f=1/v
-1/f+1/3f/2=1/v
-3+2/3f=1/v
-1/3f=1/v
V=-3f
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