Даю 40 баллов, реши 4 примера! Найдите корень уравнения
1) (7x+1)-(9x+3)=5
2) 3,4+2y=7(y-2,3)
3) 0,2(7-2y)=2,3-0,3(y-6)
4) 2/3(1/3x-1/2)=4x+2 1/2.
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