Tìm x biết
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Bài 5: Tìm x biết
1) 3(5x-1) - x(x-2) + x² - 13x = 7
2) 4(x+2) - 7(2x-1) + 9(3x-4) = 30
3) 2(5x-8) - 3(4x-5) = 4(3x-4) + 11
4) 3x(x-2) - 3(x² + 1) = x² + 1 - x(x-2)
5) 5(3x + 5) - 4(2x - 3) = 5x + 3(2x + 12)
6) (7x + 7) + 3x(2x - 1) - 2x(3x + 15) = -42