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(3+x) - x^2 = 2x -3
-x^2 +x -2x + 3 + 3
-x^2 - x + 6
x^2 + x - 6
(x - 2) ( x + 3)
maka
x = 2 atau
x= -3
x+3 - x^2 = 2x-3
x^2 +x-6=0
(x+3)(x-2)=0
x+3=0 atau x-2=0
x=-3 atau x=2