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peringatan:
maka, ...
3.(3x + 1) = 7.(x - 1)
9x + 3 = 7x - 7
9x + 3 - 7x = 7x - 7 - 7x
2x + 3 = -7
2x + 3 - 3 = -7 - 3
2x = -10
x =
x = -5
Jadi, nilai x yang memenuhi syarat adalah -5