Tìm x,biết: a/4.(18-5x)-12.(3x-7)=15.(2x-16)-6.(x+14) b/2.(5x-8)-3.(4x-5)=4.(3x-4)+11 c/(x+2).(x+3)-(x-2).(x+5)=6 d/3.(2x-1).(3x-1)-(2x-3).(9x-1)=0

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