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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