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5 - 9 классы

1 Решите уравнение а)7x+2 ( 2,4 - 5x ) = 1,8 ; б)2x+7 - x-3=4x 2 Решите уравнени...
Answer
2<2,5; {x>7 {x<10 -2<3x+1<7...
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