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1) 78+2×(1+5x)=10 2) 33+7×(15+x)=175 3) 24+6×(45 trừ 7x) 4) 1+44÷(3x+1)=18 5) 73+27÷(19 trừ 5x)=76 6) 11+28÷(29 trừ 11x)=15 7) 12+38÷
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