Question

tìm x :8x + 15x - 3x = - 400

Answer 1

8x + 15x - 3x = -400

=> (8 + 15 - 3)x = -400

=> 20x = -400

=> x = -400 : 20

=> x = -20

Answer 2

    8x + 15x - 3x = - 400

=> (8 + 15 - 3)x = - 400

              => 20x = - 400

                 => x = - 400 : 20

=> x = - 20

Answer 3

\(8x+15x-3x=-400\)

\(\Rightarrow x\left(8+15-3\right)=-400\)

\(\Rightarrow20x=-400\)

\(\Rightarrow x=-400:20\)

\(\Rightarrow x=-20\)

Vậy x=-20