15x÷3=70-2x 解:15x=(70-2x)*315x=210-6x21x=210x=10
解:15x÷3=70-2x5x=70-2x5x+2x=707x=70x=10
解15x÷3=70-2x5x+2x=707x=70x=10
解:15X÷3=70-2x5x=70-2x5x+2x=707x=70x=70÷7x=10
x=0150÷3=70-2050=50