Can I get a bit of help?

Nine more than four times a number is the same as one less than twice the number. find the number?

Each month, a shopkeeper spends 5x + 14 dollars on rent and electricity. if he spends 3x−5 dollars on rent, how much does he spend on electricity? for which value(s) of x is the amount the shopkeeper spends on electricity less than $100? explain how you found the value(s).

Is it greater than or less than7*3_9*2