3b. 3x + 15 = 75
3x = 75 - 15
3x = 60
x = 60/3
x = 20
4a. 5x = 40
x = 40/5
x = 8
4b. 7x + 25 = 130
7x = 130 - 25
7x = 105
x = 15
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3b. 3x + 15 = 75
3x = 75 - 15
3x = 60
x = 60/3
x = 20
4a. 5x = 40
x = 40/5
x = 8
4b. 7x + 25 = 130
7x = 130 - 25
7x = 105
x = 15