Помогите, пожалуйста решить системы уравнений методом подстановки:
a) 6x + 5y = 1,
2x - 3y = 33

в)4x-5y=-2
3x+2y=-13

б)5x+6y=4
3x+5y=1

г)3x-7y=1
2x+3y=16​
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