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35x - 15 - 21x + 9= x + 7
35x - 21x - 15 + 9= x + 7
14x - 6= x + 7
14x - x= 7 + 6
13x= 13
x=13/13
x= 1
Hp= {1}
35x-15-21x+9:x+7
35x-21x-x:7+15-9
13x:13
x :13/13
x : 1