Algebra: Define the value of X: 100x + -89x = 121?

Questions

Who's the lead singer of simply red?

Zorro was the secret identity of what wealthy landowner?

Whose only loss in 1983 was to kathy horvath?

'I melt with you' was this band's signature hit, released on their after the snow album in 1982?

What geographic entity 'shrunk' more than 1300 feet in 1980?