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3x= 7+5
x= 4
menurut aku mah jawabannya itu,,, ^^
kuadratkan ruas kanan dan kuadratkan ruas kiri
(3x-5)² = 7²
9x²-30x+25 = 49
9x²-30x-24 = 0
------------------- : 3
3x²-10x-8 = 0
(3x+2) (x-4) = 0
hp : x= -2/3 dan x = 4