2.6x-1.4×5=4.72.6x- 7 = 4.72.6x = 4.7+72.6x = 11.7x = 11.7 ÷ 2.6x = 4.5
化简得2.6x-7=4.7
2.6x=11.7
x=117/26
x=4.5
