1) (1.8+x)*21=71.4
2) 16(4x_3.4)=6.08
3) (x-1.25)*4.5=27
4)(x+19.64)*0.18=144
5)17(1.6-5x)=2.38
6) 9.66:(x+0.17)=23

1.8+x=71.4÷211.8+x=3.4x=3.4-1.8x=1.64x-3.4=6.08×164x-3.4=97.284x=97.28-3.44x=93.88x=93.88÷4x=23.47x-1.25=27÷4.5x-1.25=6x=6-1.25x=4.75