Enter the value of b when the expression 14.1x - b is equivalent 4.7(3x-3.5)?

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Tanya has $42 to spend at the dolphin island store. tshirts sell for $7 each and a pair of sunglases sells for $6.tanya buys 3 tshirts. how many pairs of sunglases can she buys with the amount of money she has left

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much