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3x + 18 = 30
3x = 30 - 18
3x = 12
x = 12/3
x = 4
........................................
4x + 5 = 15
4x = 15 - 5
4x = 10
x = 10/4
......................................
7x - 11 = 44
7x = 44 - 11
7x = 66
x = 66/7