0.75 ( 7X +10)-12 = 0.25(10-2.5)+11.255.25x+7.5 -12 = 0.25 (7.5) +11.255.25x -4.5 = 13.1255.25x = 13.125+4.55.25 X = 17.525x= 17.525/5.25x = 3.338thanks
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