解:解方程,此方程的解为x = 7/9
9x除以十二分之七等于12
9x ÷ 7/12 = 12
9x = 12 × 7/12
9x = 7
x = 7 ÷ 9
x = 7 × 1/9
∴x = 7/9
答:此方程的解为x = 7/9
9x÷7/12=12
9x=12×7/12
9x=7
x=7/9
9✘÷7/12=12 将✘的系数化简为1
9✘=12*12/7
✘=12*12/7*9
=4*4/7
=16/7