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<=> 30 + x = 20 + 2x
<=> 10 = x
kalikan kedalam
30 + x = 20 + 2x
Pindahkan variabel X kekiri dan angka kekanan, jangan lupa
Mengubah tanda
30 - 20 = 2x - x
10 = x
Maka nilai x adalah 10