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7=1/3(x²-4)
7=1/3x²-1/3.4
7=1/3x²-4/3
1/3x²=7+4/3
x²=7+4/3:1/3
x²=(7+4/3).3
x²=21+4
x=
x=5
x²-4=7÷⅓
x²-4=7. 3
x²-4=21
x²=21+4
x²=25
x=√25
x=5