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(это проверка)
4.2y-3.5=0.4y-1.2-1.16
4.2y-0.4y=-1.2-1.16+3.5
3.8y=1.14
y=1.14/3.8
y=0.3
____________________________________________________________
(это проверка)
4.2y-3.5=0.4y-1.2-1.16
4.2y-0.4y=-1.2-1.16+3.5
3.8y=1.14
y=1.14/3.8
y=0.3