Answer and explanation:
x here represents the unknown number or value
9+x here nine is increased by x the unknown number
14-x fourteen is decreased by x the unknown number or value
x-7 the unknown number is decreased by seven
9*x nine is multiplied by an unknown number
32/x thirty two is divided by an unknown number
2x+5 double an unknown number increased by 5
x*6 unknown number multiplied by 6
7/2x seven divided by double an unknown number
3x-11 thrice an unknown number reduced by 11
400-10x weekly withdrawals of 10 from 400
