5(×-2.8)=140
x-2.8=140÷5
x-2.8=28
x=28+2.8
x=30.8
2/3÷×=3/50
x=(2/3)÷(3/50)
x=(2/3)×(50/3)
x=100/9
2:0.5=×:9
0.5x=18
x=18÷0.5
x=36
5(×-2.8)=140
x-2.8=140÷5
x-2.8=28
x=28+2.8
x=30.8
2/3÷×=3/50
x=(2/3)÷(3/50)
x=(2/3)×(50/3)
x=100/9
2:0.5=×:9
0.5x=18
x=18÷0.5
x=36