Tìm x biết: 4(x + 2) - 7(2x - 1) + 9(3x - 4) = 30

2, Tìm x biết:
a) 4(x+2) - 7(2x-1) + 9(3x-4) = 30
b) 2(5x-8) - 3(4x-5) = 4(3x-4) + 11
c) 5x(1-2x) - 3x(x+18) = 0
d) 5x-3{4x-2 [4x-3 (5x-2)]} = 182