17 decreased by three times d equals c
three times d means we multiply d by 3:
3d
17 decreased by three times d means we subtract 3d from 17
17 - 3d
The word equals means an equation, so we set 17 - 3d equal to c:
17 - 3d = c
three times d means we multiply d by 3:
3d
17 decreased by three times d means we subtract 3d from 17
17 - 3d
The word equals means an equation, so we set 17 - 3d equal to c:
17 - 3d = c