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x^2 = 4
x = 2 atau -2
(3x-6)(3x+6)=0
3x-6 = 0
3x=6
x=2
atau
3x+6=0
3x=-6
x=-2
cara lain
9x^2-36=0
9x^2=36
x^2=4
x= +-V4
x = +- 2