помогите решить систему уравнений способом подстановки: 1) 4х +3у= 5. х - у =3...2) х- у = 7. 5х - 3у = 1..3) 6х +5у=6. 2х+у= -2 .. 4) -х+у= 4. 4х+у = - 1. 5) 8х- 3у = 7 . 3х +у =9. 6) 12х - у =18 . х+о,5у = 5
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