Tìm x biết
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Bài 10: Tìm x biết
1) \( 3(5x-1) - x(x-2) + x^2 - 13x = 7 \)
2) \( 4(x+2) - 7(2x-1) + 9(3x-4) = 30 \)
3) \( 2(5x-8) - 3(4x-5) = 4(3x-4) + 11 \)
4) \( 3x(x-2) - 3(x^2+1) = x^2 + 1 - x(x-2) \)
5) \( 5(3x+5) - 4(2x-3) = 5x + 3(2x+12) \)
6) \( (7x+7) + 3x(2x-1) - 2x(3x+15) = -42 \)