each week you set aside 18 for a stereo and put the remainder in a savings account. after 7 weeks the amount you place in the savings account is 4.2 times your total weekly pay.

So here is how you can set up the equation to figure this out:

7x = 4.2x + (7x18)

7x = 4.2x + 126

2.8x = 126

x = 45

The weekly pay is $45

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