tìm x biết

a)\(5x^3-2x\left(x^2-3x\right)-3x\left(x^2-1\right)=3x+24\)

b) \(6x\left(x-5\right)+3x\left(7-2x\right)=18\)

c) \(2x\left(3x+1\right)+\left(4-2x\right)3x=7\)

Tìm x biết

a) \(\text{2x(2x - 1) - 4x(x - 3)= 5x+10}\)

b) \(3x\left(x^2+x-1\right)-x\left(x^2-3\right)+2x\left(1-x^2\right)=2x+3\)

c) \(2x\left(x^2-x+2\right)-3x\left(x^2+1\right)+x\left(2+x^2\right)=-x\)

-Mr Ha gave up smoking five months ago.

-We haven't met her since we left school.