5×9=6×(3х+1,5)
45=6×(3х+1,5)
3х+1,5=45÷6
3х+1,5=7,5
3х=7,5-1,5
3х=6
х=6÷3
х=2
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1.4×23=(2x+1)×4.6
32.2=(2x+1)×4.6
2x+1=32.2÷4.6
2x+1=7
2x=7-1
2x=6
x=6÷2
x=3
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17×(5x-0.8)=16×3.4
17×(5x-0.8)=54.4
5x-0.8=54.4÷17
5x-0.8=3.2
5x=3.2+0.8
5x=4
x=4÷5
x=0.8