x-260=760解方程x-4.61=9和x-2.73=7.27和590+x=675

x-260=760
x=260+760
x=1020
x-4.61=9
x=4.61+9
x=13.61
x-2.73=7.27
x=2.73+7.27
x=10
590+x=675
x=675-590
x=85