(16)3(x-2.1)=8.4(17)5.06x+0.94x=1.8(18)(2x+3)/0.5=10(19)5x+24*1.5=66(20)7.2x-3.8x-7.8=12.6

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(16)3(x-2.1)=8.4(17)5.06x+0.94x=1.8(18)(2x+3)/0.5=10(19)5x+24*1.5=66(20)7.2x-3.8x-7.8=12.6
(16)3(x-2.1)=8.4(17)5.06x+0.94x=1.8(18)(2x+3)/0.5=10(19)5x+24*1.5=66(20)7.2x-3.8x-7.8=12.6

(16)3(x-2.1)=8.4(17)5.06x+0.94x=1.8(18)(2x+3)/0.5=10(19)5x+24*1.5=66(20)7.2x-3.8x-7.8=12.6
(16)3(x-2.1)=8.4
3x-6.3=8.4
3x=14.7
x=4.9
(17)5.06x+0.94x=1.8
6x=1.8
x=0.3
(18)(2x+3)/0.5=10
2x+3=5
2x=2
x=1
(19)5x+24*1.5=66
5x=30
x=6
(20)7.2x-3.8x-7.8=12.6
3.4x=20.4
x=6