Himpunan penyelesaian dari 2 ( 3 x + 5 ) – 2 ( 7 x – 3 ) = x + 7

= 6x + 10 – 14x + 6 = x + 7
= -8x + 16  = x + 7
= -8x – x  = 7 – 16
= -9x = -9
= x = 1