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a. menggunakan sifat kesebangunan
perbandingan sisi-sinya sama
6 = 8
9 2x + 8
kedua ruas dikali 2x + 8
6 . (2x + 8) = 8
9
kedua ruas dikali 9 / 6
2x + 8 = 9 x 8
6
2x + 8 = 12
kedua ruas dikurangi 8
2x = 4
kedua ruas dibagi 2
x = 2