Problem3x+9=03x + 9 = 03x+9=0Step-by-step solution兩邊同時減去 999：3x=−93x = -93x=−9。兩邊同時除以 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