How do you find the equality of 4/12=A/3

Need santino bought a 3/4 pound bag of chocolate chips. he used 2/3 of the bag whule baking. how many pounds of chocolate chips did he use while baking?

Question: what is the value of x 4x-2= (-7) +5x. it would be greatly appreciated if someone could actually explain to me step by step

Tim's phone service charges $23.06 plus an additional $0.22 for each text message sent per month. if tim's phone bill was $28.56, which equation could be used to find how many text messages, x, tim sent last month?