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18 + 7x = 6x - 8
18 + 7x - 6x = 6x - 6x - 8
18 + x = -8
18 - 18 + x = -8 - 18
x = -26
18 + 7x = 6x - 8
18 + 7x - 18 = 6x - 8 -18 (kedua ruas -18)
7x = 6x - 26
7x - 6x = 6x - 26 - 6x (kedua ruas -6x)
x = -26
Himpunan Penyelesaian x= -26