a) (x-101):123=456
x-101 =456x123
x-101 =56088
x =56088+101
x =56189
b) (x-100):105=248
x-100 =248x105
x-100 =26040
x =26040+100
x =26140
( x - 101 ) : 123 = 456
x - 101 = 456 x 123
x - 101 = 56088
x = 56088 + 101
x = 56189
( x - 100 ) : 105 = 248
x - 100 = 248 x 105
x - 100 = 26040
x = 26040 + 100
x = 26140