877. Знайдіть корінь рівняння:
1) 3(x-2) + 4x = 7(x - 1) + 1;
2) 2(x + 1) + 4x = 6(x + 3);
[tex]3)3x(2 + x) - 4(1 - {x}^{2} ) = 7 {x}^{2} + 6x [/tex]
[tex]4)( {x}^{2} + 4x - 8) - (7x - 2 {x}^{2} - 5) = 3 {x}^{2} - (3x + 3)[/tex]
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