求教:9(x-2.求教:9(x-2.
求教:9(x-2.9(x-2.5)=4x9x-22.5=4x9x-4x=22.55x=22.5x=22.5÷5x=4.5
9x-2.5*9=4x9x-4x=2.5*95x=22.5x=4.5
9x-22.5=4x5x=22.5x=4.5