( 13.2+9)x = 33.3(8-3)x = 105
22.2x=33.3 5x= 105
22.2 x÷22.2 = 33.3÷22.2 5x÷5 = 105÷5
x= 1.5 x=2 1
5.4x+x = 12.8 x-0.36 x = 16
(5.4+ 1)x = 12.8( 1-0.36)x = 16
6.4x= 12.8 0.64x= 16
6.4÷6.4 = 12.8÷6.4 0.64÷0.64 = 16÷0.64。
x=2 x=25