Problem3x+9=03x + 9 = 03x+9=0Step-by-step solutionTrừ 999 ở cả hai vế: 3x=−93x = -93x=−9.Chia cả hai vế cho 333: x=−3x = -3x=−3.Answerx=−3x = -3x=−3Want to solve a different problem? Open the linear solver →Related worked examples/solve/algebra/2x-plus-3-equals-7/solve/algebra/5x-minus-10-equals-15