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- 3x + x = 21 - 69
-2x = -48
x = -48 / -2x
x = 24
semoga menbantu :)
69 -21 = 3x - x (-3x dan 21 tukar ruas, sehingga menjadi 3x dan -21)
48 = 2x
48/2 = 2x/2
24 = x atau x =24