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( 35x - 25 ) - ( 21x - 15 ) = x + 16
( 35x - 21x ) - ( -15 + 25 ) = x + 16
14x - 10 = x + 16
14x - x = 16 + 10
13x = 26
x = 26 : 13
x = 2
HP = { 2 }
35x - 25 - 21x + 15 = x + 16
14 x - 10 = x + 16
13 x = 26
x = 2